Update Ubuntu 25.10 to 26.04 - #121730

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Update Ubuntu 25.10 to 26.04#121730
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  • Ubuntu 25.10 was added while it was in preview, in preparation for 26.04.
  • 25.10 is now GA and 26.04 is in preview (been so for a while but the official container release is new-ish and we are dependent on that)
  • We'll validate CI relability in main and then move to servicing when we're comfortable.

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Pull Request Overview

This PR updates the Ubuntu version references in Helix CI/CD pipeline configurations from 25.10 (October 2025, now GA) to 26.04 (April 2026, currently in preview). The changes prepare the build infrastructure for testing against the upcoming Ubuntu LTS release.

  • Updated all Ubuntu version references from 25.10 to 26.04 across pipeline configuration files
  • Modified both queue names and container image references to use the new version
  • Updated comments to reflect the new "latest" Ubuntu version

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

FileDescription
eng/pipelines/libraries/helix-queues-setup.ymlUpdated Ubuntu ARM64 and AMD64 queue configurations to use 26.04 containers
eng/pipelines/installer/helix-queues-setup.ymlUpdated Ubuntu ARM64 queue configuration to use 26.04 container
eng/pipelines/helix-platforms.ymlUpdated platform variable definitions and comments for Ubuntu x64 and ARM64 to reference 26.04

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/azp run runtime-extra-platforms

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PR validation looks good. Now testing extra platforms.

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Extra platforms looks clear as well. I didn't see any failures for Ubuntu 26.04. I do see it present in passing build legs.

This is the same dance we have played before. Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas? We did that with Debian 13 and Ubuntu 25.04 and 25.10 and it seemed to work out.

Note that I deleted 25.10 and 25.04 images from the pre-reqs repo. I believe 25.10 is also in release/10.0. If CI health looks good next week, I'll make a similar PR on that branch. Sound good?

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Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas?

LGTM

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/ba-g "Known issues and problems with unrelated build/test legs"

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Update Ubuntu container references from 25.10 to 26.04 (#122130)
699969d
Fixes Issue <!-- N/A -->
main PR #121730
# Description
Backports Ubuntu container version updates from main. Changes Ubuntu
25.10 (preview during initial addition) to 26.04 (now in preview with
official container releases) for Helix test infrastructure.
Updates three container references:
- `eng/pipelines/installer/helix-queues-setup.yml`: Linux ARM64
- `eng/pipelines/libraries/helix-queues-setup.yml`: Linux ARM64 and
AMD64
All changes target container images only
(`@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-26.04-*`). VM
references remain unchanged. The `helix-platforms.yml` file does not
exist in release/10.0.
# Customer Impact
No direct customer impact. Infrastructure change to align test
environments with current Ubuntu preview release.
# Regression
No. This is a proactive infrastructure update.
# Testing
Changes are configuration-only. CI validation in main has been completed
per the original PR.
# Risk
Low. Container references already validated in main branch. No code
changes, only test infrastructure configuration.
<!-- START COPILOT CODING AGENT SUFFIX -->
<details>
<summary>Original prompt</summary>
> Please apply PR #121730 to the release/10.0 branch. I don't think the
helix-platforms.yml file exists there. Please do not create it.
> > #121730
> > The goal after this change is that all Ubuntu container references are
using Ubuntu 26.04. Do not change VM references. Those will be handled
separately.
</details>
<!-- START COPILOT CODING AGENT TIPS -->
---
✨ Let Copilot coding agent [set things up for
you](https://github.com/dotnet/runtime/issues/new?title=✨+Set+up+Copilot+instructions&body=Configure%20instructions%20for%20this%20repository%20as%20documented%20in%20%5BBest%20practices%20for%20Copilot%20coding%20agent%20in%20your%20repository%5D%28https://gh.io/copilot-coding-agent-tips%29%2E%0A%0A%3COnboard%20this%20repo%3E&assignees=copilot)
— coding agent works faster and does higher quality work when set up for
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---------
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Update Ubuntu 25.10 to 26.04 - #121730
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Update Ubuntu 25.10 to 26.04#121730
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  • Ubuntu 25.10 was added while it was in preview, in preparation for 26.04.
  • 25.10 is now GA and 26.04 is in preview (been so for a while but the official container release is new-ish and we are dependent on that)
  • We'll validate CI relability in main and then move to servicing when we're comfortable.
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Pull Request Overview
This PR updates the Ubuntu version references in Helix CI/CD pipeline configurations from 25.10 (October 2025, now GA) to 26.04 (April 2026, currently in preview). The changes prepare the build infrastructure for testing against the upcoming Ubuntu LTS release.
  • Updated all Ubuntu version references from 25.10 to 26.04 across pipeline configuration files
  • Modified both queue names and container image references to use the new version
  • Updated comments to reflect the new "latest" Ubuntu version
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
FileDescription
eng/pipelines/libraries/helix-queues-setup.ymlUpdated Ubuntu ARM64 and AMD64 queue configurations to use 26.04 containers
eng/pipelines/installer/helix-queues-setup.ymlUpdated Ubuntu ARM64 queue configuration to use 26.04 container
eng/pipelines/helix-platforms.ymlUpdated platform variable definitions and comments for Ubuntu x64 and ARM64 to reference 26.04

This was referenced Nov 18, 2025

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/azp run runtime-extra-platforms
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PR validation looks good. Now testing extra platforms.
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Extra platforms looks clear as well. I didn't see any failures for Ubuntu 26.04. I do see it present in passing build legs.
This is the same dance we have played before. Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas? We did that with Debian 13 and Ubuntu 25.04 and 25.10 and it seemed to work out.
Note that I deleted 25.10 and 25.04 images from the pre-reqs repo. I believe 25.10 is also in release/10.0. If CI health looks good next week, I'll make a similar PR on that branch. Sound good?
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Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas?
LGTM
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/ba-g "Known issues and problems with unrelated build/test legs"
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@richlander
Update Ubuntu container references from 25.10 to 26.04 (#122130)
699969d
Fixes Issue <!-- N/A -->
main PR #121730
# Description
Backports Ubuntu container version updates from main. Changes Ubuntu
25.10 (preview during initial addition) to 26.04 (now in preview with
official container releases) for Helix test infrastructure.
Updates three container references:
- `eng/pipelines/installer/helix-queues-setup.yml`: Linux ARM64
- `eng/pipelines/libraries/helix-queues-setup.yml`: Linux ARM64 and
AMD64
All changes target container images only
(`@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-26.04-*`). VM
references remain unchanged. The `helix-platforms.yml` file does not
exist in release/10.0.
# Customer Impact
No direct customer impact. Infrastructure change to align test
environments with current Ubuntu preview release.
# Regression
No. This is a proactive infrastructure update.
# Testing
Changes are configuration-only. CI validation in main has been completed
per the original PR.
# Risk
Low. Container references already validated in main branch. No code
changes, only test infrastructure configuration.
<!-- START COPILOT CODING AGENT SUFFIX -->
<details>
<summary>Original prompt</summary>
> Please apply PR #121730 to the release/10.0 branch. I don't think the
helix-platforms.yml file exists there. Please do not create it.
> > #121730
> > The goal after this change is that all Ubuntu container references are
using Ubuntu 26.04. Do not change VM references. Those will be handled
separately.
</details>
<!-- START COPILOT CODING AGENT TIPS -->
---
✨ Let Copilot coding agent [set things up for
you](https://github.com/dotnet/runtime/issues/new?title=✨+Set+up+Copilot+instructions&body=Configure%20instructions%20for%20this%20repository%20as%20documented%20in%20%5BBest%20practices%20for%20Copilot%20coding%20agent%20in%20your%20repository%5D%28https://gh.io/copilot-coding-agent-tips%29%2E%0A%0A%3COnboard%20this%20repo%3E&assignees=copilot)
— coding agent works faster and does higher quality work when set up for
your repo.
---------
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: richlander <2608468+richlander@users.noreply.github.com>
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Update Ubuntu 25.10 to 26.04 - #121730
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Update Ubuntu 25.10 to 26.04#121730
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  • Ubuntu 25.10 was added while it was in preview, in preparation for 26.04.
  • 25.10 is now GA and 26.04 is in preview (been so for a while but the official container release is new-ish and we are dependent on that)
  • We'll validate CI relability in main and then move to servicing when we're comfortable.
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Pull Request Overview
This PR updates the Ubuntu version references in Helix CI/CD pipeline configurations from 25.10 (October 2025, now GA) to 26.04 (April 2026, currently in preview). The changes prepare the build infrastructure for testing against the upcoming Ubuntu LTS release.
  • Updated all Ubuntu version references from 25.10 to 26.04 across pipeline configuration files
  • Modified both queue names and container image references to use the new version
  • Updated comments to reflect the new "latest" Ubuntu version
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
FileDescription
eng/pipelines/libraries/helix-queues-setup.ymlUpdated Ubuntu ARM64 and AMD64 queue configurations to use 26.04 containers
eng/pipelines/installer/helix-queues-setup.ymlUpdated Ubuntu ARM64 queue configuration to use 26.04 container
eng/pipelines/helix-platforms.ymlUpdated platform variable definitions and comments for Ubuntu x64 and ARM64 to reference 26.04

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/azp run runtime-extra-platforms
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PR validation looks good. Now testing extra platforms.
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Extra platforms looks clear as well. I didn't see any failures for Ubuntu 26.04. I do see it present in passing build legs.
This is the same dance we have played before. Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas? We did that with Debian 13 and Ubuntu 25.04 and 25.10 and it seemed to work out.
Note that I deleted 25.10 and 25.04 images from the pre-reqs repo. I believe 25.10 is also in release/10.0. If CI health looks good next week, I'll make a similar PR on that branch. Sound good?
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Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas?
LGTM
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/ba-g "Known issues and problems with unrelated build/test legs"
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@richlander
Update Ubuntu container references from 25.10 to 26.04 (#122130)
699969d
Fixes Issue <!-- N/A -->
main PR #121730
# Description
Backports Ubuntu container version updates from main. Changes Ubuntu
25.10 (preview during initial addition) to 26.04 (now in preview with
official container releases) for Helix test infrastructure.
Updates three container references:
- `eng/pipelines/installer/helix-queues-setup.yml`: Linux ARM64
- `eng/pipelines/libraries/helix-queues-setup.yml`: Linux ARM64 and
AMD64
All changes target container images only
(`@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-26.04-*`). VM
references remain unchanged. The `helix-platforms.yml` file does not
exist in release/10.0.
# Customer Impact
No direct customer impact. Infrastructure change to align test
environments with current Ubuntu preview release.
# Regression
No. This is a proactive infrastructure update.
# Testing
Changes are configuration-only. CI validation in main has been completed
per the original PR.
# Risk
Low. Container references already validated in main branch. No code
changes, only test infrastructure configuration.
<!-- START COPILOT CODING AGENT SUFFIX -->
<details>
<summary>Original prompt</summary>
> Please apply PR #121730 to the release/10.0 branch. I don't think the
helix-platforms.yml file exists there. Please do not create it.
> > #121730
> > The goal after this change is that all Ubuntu container references are
using Ubuntu 26.04. Do not change VM references. Those will be handled
separately.
</details>
<!-- START COPILOT CODING AGENT TIPS -->
---
✨ Let Copilot coding agent [set things up for
you](https://github.com/dotnet/runtime/issues/new?title=✨+Set+up+Copilot+instructions&body=Configure%20instructions%20for%20this%20repository%20as%20documented%20in%20%5BBest%20practices%20for%20Copilot%20coding%20agent%20in%20your%20repository%5D%28https://gh.io/copilot-coding-agent-tips%29%2E%0A%0A%3COnboard%20this%20repo%3E&assignees=copilot)
— coding agent works faster and does higher quality work when set up for
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---------
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Co-authored-by: richlander <2608468+richlander@users.noreply.github.com>
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Update Ubuntu 25.10 to 26.04 - #121730
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Update Ubuntu 25.10 to 26.04#121730
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  • Ubuntu 25.10 was added while it was in preview, in preparation for 26.04.
  • 25.10 is now GA and 26.04 is in preview (been so for a while but the official container release is new-ish and we are dependent on that)
  • We'll validate CI relability in main and then move to servicing when we're comfortable.
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Pull Request Overview
This PR updates the Ubuntu version references in Helix CI/CD pipeline configurations from 25.10 (October 2025, now GA) to 26.04 (April 2026, currently in preview). The changes prepare the build infrastructure for testing against the upcoming Ubuntu LTS release.
  • Updated all Ubuntu version references from 25.10 to 26.04 across pipeline configuration files
  • Modified both queue names and container image references to use the new version
  • Updated comments to reflect the new "latest" Ubuntu version
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
FileDescription
eng/pipelines/libraries/helix-queues-setup.ymlUpdated Ubuntu ARM64 and AMD64 queue configurations to use 26.04 containers
eng/pipelines/installer/helix-queues-setup.ymlUpdated Ubuntu ARM64 queue configuration to use 26.04 container
eng/pipelines/helix-platforms.ymlUpdated platform variable definitions and comments for Ubuntu x64 and ARM64 to reference 26.04

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/azp run runtime-extra-platforms
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PR validation looks good. Now testing extra platforms.
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Extra platforms looks clear as well. I didn't see any failures for Ubuntu 26.04. I do see it present in passing build legs.
This is the same dance we have played before. Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas? We did that with Debian 13 and Ubuntu 25.04 and 25.10 and it seemed to work out.
Note that I deleted 25.10 and 25.04 images from the pre-reqs repo. I believe 25.10 is also in release/10.0. If CI health looks good next week, I'll make a similar PR on that branch. Sound good?
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Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas?
LGTM
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/ba-g "Known issues and problems with unrelated build/test legs"
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@richlander
Update Ubuntu container references from 25.10 to 26.04 (#122130)
699969d
Fixes Issue <!-- N/A -->
main PR #121730
# Description
Backports Ubuntu container version updates from main. Changes Ubuntu
25.10 (preview during initial addition) to 26.04 (now in preview with
official container releases) for Helix test infrastructure.
Updates three container references:
- `eng/pipelines/installer/helix-queues-setup.yml`: Linux ARM64
- `eng/pipelines/libraries/helix-queues-setup.yml`: Linux ARM64 and
AMD64
All changes target container images only
(`@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-26.04-*`). VM
references remain unchanged. The `helix-platforms.yml` file does not
exist in release/10.0.
# Customer Impact
No direct customer impact. Infrastructure change to align test
environments with current Ubuntu preview release.
# Regression
No. This is a proactive infrastructure update.
# Testing
Changes are configuration-only. CI validation in main has been completed
per the original PR.
# Risk
Low. Container references already validated in main branch. No code
changes, only test infrastructure configuration.
<!-- START COPILOT CODING AGENT SUFFIX -->
<details>
<summary>Original prompt</summary>
> Please apply PR #121730 to the release/10.0 branch. I don't think the
helix-platforms.yml file exists there. Please do not create it.
> > #121730
> > The goal after this change is that all Ubuntu container references are
using Ubuntu 26.04. Do not change VM references. Those will be handled
separately.
</details>
<!-- START COPILOT CODING AGENT TIPS -->
---
✨ Let Copilot coding agent [set things up for
you](https://github.com/dotnet/runtime/issues/new?title=✨+Set+up+Copilot+instructions&body=Configure%20instructions%20for%20this%20repository%20as%20documented%20in%20%5BBest%20practices%20for%20Copilot%20coding%20agent%20in%20your%20repository%5D%28https://gh.io/copilot-coding-agent-tips%29%2E%0A%0A%3COnboard%20this%20repo%3E&assignees=copilot)
— coding agent works faster and does higher quality work when set up for
your repo.
---------
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: richlander <2608468+richlander@users.noreply.github.com>
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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Update Ubuntu 25.10 to 26.04 - #121730
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richlander merged 1 commit into
dotnet:mainfrom 
richlander:ubuntu2604
Nov 18, 2025
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Update Ubuntu 25.10 to 26.04#121730
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  • Ubuntu 25.10 was added while it was in preview, in preparation for 26.04.
  • 25.10 is now GA and 26.04 is in preview (been so for a while but the official container release is new-ish and we are dependent on that)
  • We'll validate CI relability in main and then move to servicing when we're comfortable.
CopilotAI
review requested due to automatic review settings
November 18, 2025 06:14
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Pull Request Overview
This PR updates the Ubuntu version references in Helix CI/CD pipeline configurations from 25.10 (October 2025, now GA) to 26.04 (April 2026, currently in preview). The changes prepare the build infrastructure for testing against the upcoming Ubuntu LTS release.
  • Updated all Ubuntu version references from 25.10 to 26.04 across pipeline configuration files
  • Modified both queue names and container image references to use the new version
  • Updated comments to reflect the new "latest" Ubuntu version
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
FileDescription
eng/pipelines/libraries/helix-queues-setup.ymlUpdated Ubuntu ARM64 and AMD64 queue configurations to use 26.04 containers
eng/pipelines/installer/helix-queues-setup.ymlUpdated Ubuntu ARM64 queue configuration to use 26.04 container
eng/pipelines/helix-platforms.ymlUpdated platform variable definitions and comments for Ubuntu x64 and ARM64 to reference 26.04

This was referenced Nov 18, 2025

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/azp run runtime-extra-platforms
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Azure Pipelines successfully started running 1 pipeline(s).
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PR validation looks good. Now testing extra platforms.
@richlander
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Nov 18, 2025•

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Extra platforms looks clear as well. I didn't see any failures for Ubuntu 26.04. I do see it present in passing build legs.
This is the same dance we have played before. Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas? We did that with Debian 13 and Ubuntu 25.04 and 25.10 and it seemed to work out.
Note that I deleted 25.10 and 25.04 images from the pre-reqs repo. I believe 25.10 is also in release/10.0. If CI health looks good next week, I'll make a similar PR on that branch. Sound good?
@jkotas
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Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas?
LGTM
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/ba-g "Known issues and problems with unrelated build/test legs"
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merged commit ea8d8a0
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dotnet:mainNov 18, 2025

177 of 221 checks passed

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that referenced
this pull request
Dec 3, 2025
@richlander
Update Ubuntu container references from 25.10 to 26.04 (#122130)
699969d
Fixes Issue <!-- N/A -->
main PR #121730
# Description
Backports Ubuntu container version updates from main. Changes Ubuntu
25.10 (preview during initial addition) to 26.04 (now in preview with
official container releases) for Helix test infrastructure.
Updates three container references:
- `eng/pipelines/installer/helix-queues-setup.yml`: Linux ARM64
- `eng/pipelines/libraries/helix-queues-setup.yml`: Linux ARM64 and
AMD64
All changes target container images only
(`@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-26.04-*`). VM
references remain unchanged. The `helix-platforms.yml` file does not
exist in release/10.0.
# Customer Impact
No direct customer impact. Infrastructure change to align test
environments with current Ubuntu preview release.
# Regression
No. This is a proactive infrastructure update.
# Testing
Changes are configuration-only. CI validation in main has been completed
per the original PR.
# Risk
Low. Container references already validated in main branch. No code
changes, only test infrastructure configuration.
<!-- START COPILOT CODING AGENT SUFFIX -->
<details>
<summary>Original prompt</summary>
> Please apply PR #121730 to the release/10.0 branch. I don't think the
helix-platforms.yml file exists there. Please do not create it.
> > #121730
> > The goal after this change is that all Ubuntu container references are
using Ubuntu 26.04. Do not change VM references. Those will be handled
separately.
</details>
<!-- START COPILOT CODING AGENT TIPS -->
---
✨ Let Copilot coding agent [set things up for
you](https://github.com/dotnet/runtime/issues/new?title=✨+Set+up+Copilot+instructions&body=Configure%20instructions%20for%20this%20repository%20as%20documented%20in%20%5BBest%20practices%20for%20Copilot%20coding%20agent%20in%20your%20repository%5D%28https://gh.io/copilot-coding-agent-tips%29%2E%0A%0A%3COnboard%20this%20repo%3E&assignees=copilot)
— coding agent works faster and does higher quality work when set up for
your repo.
---------
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: richlander <2608468+richlander@users.noreply.github.com>
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Update Ubuntu 25.10 to 26.04 - #121730
Merged
richlander merged 1 commit into
dotnet:mainfrom 
richlander:ubuntu2604
Nov 18, 2025
Merged
Update Ubuntu 25.10 to 26.04#121730
richlander merged 1 commit into
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@richlander
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  • Ubuntu 25.10 was added while it was in preview, in preparation for 26.04.
  • 25.10 is now GA and 26.04 is in preview (been so for a while but the official container release is new-ish and we are dependent on that)
  • We'll validate CI relability in main and then move to servicing when we're comfortable.
CopilotAI
review requested due to automatic review settings
November 18, 2025 06:14
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Pull Request Overview
This PR updates the Ubuntu version references in Helix CI/CD pipeline configurations from 25.10 (October 2025, now GA) to 26.04 (April 2026, currently in preview). The changes prepare the build infrastructure for testing against the upcoming Ubuntu LTS release.
  • Updated all Ubuntu version references from 25.10 to 26.04 across pipeline configuration files
  • Modified both queue names and container image references to use the new version
  • Updated comments to reflect the new "latest" Ubuntu version
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
FileDescription
eng/pipelines/libraries/helix-queues-setup.ymlUpdated Ubuntu ARM64 and AMD64 queue configurations to use 26.04 containers
eng/pipelines/installer/helix-queues-setup.ymlUpdated Ubuntu ARM64 queue configuration to use 26.04 container
eng/pipelines/helix-platforms.ymlUpdated platform variable definitions and comments for Ubuntu x64 and ARM64 to reference 26.04

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/azp run runtime-extra-platforms
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PR validation looks good. Now testing extra platforms.
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Extra platforms looks clear as well. I didn't see any failures for Ubuntu 26.04. I do see it present in passing build legs.
This is the same dance we have played before. Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas? We did that with Debian 13 and Ubuntu 25.04 and 25.10 and it seemed to work out.
Note that I deleted 25.10 and 25.04 images from the pre-reqs repo. I believe 25.10 is also in release/10.0. If CI health looks good next week, I'll make a similar PR on that branch. Sound good?
@jkotas
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Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas?
LGTM
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/ba-g "Known issues and problems with unrelated build/test legs"
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@richlander
Update Ubuntu container references from 25.10 to 26.04 (#122130)
699969d
Fixes Issue <!-- N/A -->
main PR #121730
# Description
Backports Ubuntu container version updates from main. Changes Ubuntu
25.10 (preview during initial addition) to 26.04 (now in preview with
official container releases) for Helix test infrastructure.
Updates three container references:
- `eng/pipelines/installer/helix-queues-setup.yml`: Linux ARM64
- `eng/pipelines/libraries/helix-queues-setup.yml`: Linux ARM64 and
AMD64
All changes target container images only
(`@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-26.04-*`). VM
references remain unchanged. The `helix-platforms.yml` file does not
exist in release/10.0.
# Customer Impact
No direct customer impact. Infrastructure change to align test
environments with current Ubuntu preview release.
# Regression
No. This is a proactive infrastructure update.
# Testing
Changes are configuration-only. CI validation in main has been completed
per the original PR.
# Risk
Low. Container references already validated in main branch. No code
changes, only test infrastructure configuration.
<!-- START COPILOT CODING AGENT SUFFIX -->
<details>
<summary>Original prompt</summary>
> Please apply PR #121730 to the release/10.0 branch. I don't think the
helix-platforms.yml file exists there. Please do not create it.
> > #121730
> > The goal after this change is that all Ubuntu container references are
using Ubuntu 26.04. Do not change VM references. Those will be handled
separately.
</details>
<!-- START COPILOT CODING AGENT TIPS -->
---
✨ Let Copilot coding agent [set things up for
you](https://github.com/dotnet/runtime/issues/new?title=✨+Set+up+Copilot+instructions&body=Configure%20instructions%20for%20this%20repository%20as%20documented%20in%20%5BBest%20practices%20for%20Copilot%20coding%20agent%20in%20your%20repository%5D%28https://gh.io/copilot-coding-agent-tips%29%2E%0A%0A%3COnboard%20this%20repo%3E&assignees=copilot)
— coding agent works faster and does higher quality work when set up for
your repo.
---------
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: richlander <2608468+richlander@users.noreply.github.com>
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Update Ubuntu 25.10 to 26.04 - #121730
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richlander merged 1 commit into
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Update Ubuntu 25.10 to 26.04#121730
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  • Ubuntu 25.10 was added while it was in preview, in preparation for 26.04.
  • 25.10 is now GA and 26.04 is in preview (been so for a while but the official container release is new-ish and we are dependent on that)
  • We'll validate CI relability in main and then move to servicing when we're comfortable.
CopilotAI
review requested due to automatic review settings
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Pull Request Overview
This PR updates the Ubuntu version references in Helix CI/CD pipeline configurations from 25.10 (October 2025, now GA) to 26.04 (April 2026, currently in preview). The changes prepare the build infrastructure for testing against the upcoming Ubuntu LTS release.
  • Updated all Ubuntu version references from 25.10 to 26.04 across pipeline configuration files
  • Modified both queue names and container image references to use the new version
  • Updated comments to reflect the new "latest" Ubuntu version
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
FileDescription
eng/pipelines/libraries/helix-queues-setup.ymlUpdated Ubuntu ARM64 and AMD64 queue configurations to use 26.04 containers
eng/pipelines/installer/helix-queues-setup.ymlUpdated Ubuntu ARM64 queue configuration to use 26.04 container
eng/pipelines/helix-platforms.ymlUpdated platform variable definitions and comments for Ubuntu x64 and ARM64 to reference 26.04

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/azp run runtime-extra-platforms
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PR validation looks good. Now testing extra platforms.
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Extra platforms looks clear as well. I didn't see any failures for Ubuntu 26.04. I do see it present in passing build legs.
This is the same dance we have played before. Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas? We did that with Debian 13 and Ubuntu 25.04 and 25.10 and it seemed to work out.
Note that I deleted 25.10 and 25.04 images from the pre-reqs repo. I believe 25.10 is also in release/10.0. If CI health looks good next week, I'll make a similar PR on that branch. Sound good?
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Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas?
LGTM
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/ba-g "Known issues and problems with unrelated build/test legs"
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@richlander
Update Ubuntu container references from 25.10 to 26.04 (#122130)
699969d
Fixes Issue <!-- N/A -->
main PR #121730
# Description
Backports Ubuntu container version updates from main. Changes Ubuntu
25.10 (preview during initial addition) to 26.04 (now in preview with
official container releases) for Helix test infrastructure.
Updates three container references:
- `eng/pipelines/installer/helix-queues-setup.yml`: Linux ARM64
- `eng/pipelines/libraries/helix-queues-setup.yml`: Linux ARM64 and
AMD64
All changes target container images only
(`@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-26.04-*`). VM
references remain unchanged. The `helix-platforms.yml` file does not
exist in release/10.0.
# Customer Impact
No direct customer impact. Infrastructure change to align test
environments with current Ubuntu preview release.
# Regression
No. This is a proactive infrastructure update.
# Testing
Changes are configuration-only. CI validation in main has been completed
per the original PR.
# Risk
Low. Container references already validated in main branch. No code
changes, only test infrastructure configuration.
<!-- START COPILOT CODING AGENT SUFFIX -->
<details>
<summary>Original prompt</summary>
> Please apply PR #121730 to the release/10.0 branch. I don't think the
helix-platforms.yml file exists there. Please do not create it.
> > #121730
> > The goal after this change is that all Ubuntu container references are
using Ubuntu 26.04. Do not change VM references. Those will be handled
separately.
</details>
<!-- START COPILOT CODING AGENT TIPS -->
---
✨ Let Copilot coding agent [set things up for
you](https://github.com/dotnet/runtime/issues/new?title=✨+Set+up+Copilot+instructions&body=Configure%20instructions%20for%20this%20repository%20as%20documented%20in%20%5BBest%20practices%20for%20Copilot%20coding%20agent%20in%20your%20repository%5D%28https://gh.io/copilot-coding-agent-tips%29%2E%0A%0A%3COnboard%20this%20repo%3E&assignees=copilot)
— coding agent works faster and does higher quality work when set up for
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---------
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: richlander <2608468+richlander@users.noreply.github.com>
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Update Ubuntu 25.10 to 26.04 - #121730
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Update Ubuntu 25.10 to 26.04#121730
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  • Ubuntu 25.10 was added while it was in preview, in preparation for 26.04.
  • 25.10 is now GA and 26.04 is in preview (been so for a while but the official container release is new-ish and we are dependent on that)
  • We'll validate CI relability in main and then move to servicing when we're comfortable.
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Pull Request Overview
This PR updates the Ubuntu version references in Helix CI/CD pipeline configurations from 25.10 (October 2025, now GA) to 26.04 (April 2026, currently in preview). The changes prepare the build infrastructure for testing against the upcoming Ubuntu LTS release.
  • Updated all Ubuntu version references from 25.10 to 26.04 across pipeline configuration files
  • Modified both queue names and container image references to use the new version
  • Updated comments to reflect the new "latest" Ubuntu version
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
FileDescription
eng/pipelines/libraries/helix-queues-setup.ymlUpdated Ubuntu ARM64 and AMD64 queue configurations to use 26.04 containers
eng/pipelines/installer/helix-queues-setup.ymlUpdated Ubuntu ARM64 queue configuration to use 26.04 container
eng/pipelines/helix-platforms.ymlUpdated platform variable definitions and comments for Ubuntu x64 and ARM64 to reference 26.04

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/azp run runtime-extra-platforms
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PR validation looks good. Now testing extra platforms.
@richlander
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edited

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Extra platforms looks clear as well. I didn't see any failures for Ubuntu 26.04. I do see it present in passing build legs.
This is the same dance we have played before. Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas? We did that with Debian 13 and Ubuntu 25.04 and 25.10 and it seemed to work out.
Note that I deleted 25.10 and 25.04 images from the pre-reqs repo. I believe 25.10 is also in release/10.0. If CI health looks good next week, I'll make a similar PR on that branch. Sound good?
@jkotas
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Are you OK taking in preview Ubuntu 26.04 into runtime main @jkotas?
LGTM
@richlander
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/ba-g "Known issues and problems with unrelated build/test legs"
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merged commit ea8d8a0
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dotnet:mainNov 18, 2025

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richlander added a commit
that referenced
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Dec 3, 2025
@richlander
Update Ubuntu container references from 25.10 to 26.04 (#122130)
699969d
Fixes Issue <!-- N/A -->
main PR #121730
# Description
Backports Ubuntu container version updates from main. Changes Ubuntu
25.10 (preview during initial addition) to 26.04 (now in preview with
official container releases) for Helix test infrastructure.
Updates three container references:
- `eng/pipelines/installer/helix-queues-setup.yml`: Linux ARM64
- `eng/pipelines/libraries/helix-queues-setup.yml`: Linux ARM64 and
AMD64
All changes target container images only
(`@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-26.04-*`). VM
references remain unchanged. The `helix-platforms.yml` file does not
exist in release/10.0.
# Customer Impact
No direct customer impact. Infrastructure change to align test
environments with current Ubuntu preview release.
# Regression
No. This is a proactive infrastructure update.
# Testing
Changes are configuration-only. CI validation in main has been completed
per the original PR.
# Risk
Low. Container references already validated in main branch. No code
changes, only test infrastructure configuration.
<!-- START COPILOT CODING AGENT SUFFIX -->
<details>
<summary>Original prompt</summary>
> Please apply PR #121730 to the release/10.0 branch. I don't think the
helix-platforms.yml file exists there. Please do not create it.
> > #121730
> > The goal after this change is that all Ubuntu container references are
using Ubuntu 26.04. Do not change VM references. Those will be handled
separately.
</details>
<!-- START COPILOT CODING AGENT TIPS -->
---
✨ Let Copilot coding agent [set things up for
you](https://github.com/dotnet/runtime/issues/new?title=✨+Set+up+Copilot+instructions&body=Configure%20instructions%20for%20this%20repository%20as%20documented%20in%20%5BBest%20practices%20for%20Copilot%20coding%20agent%20in%20your%20repository%5D%28https://gh.io/copilot-coding-agent-tips%29%2E%0A%0A%3COnboard%20this%20repo%3E&assignees=copilot)
— coding agent works faster and does higher quality work when set up for
your repo.
---------
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: richlander <2608468+richlander@users.noreply.github.com>
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