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Update CI pipeline from Ubuntu 20.04 (EOL) to Ubuntu 26.04#1552

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alinpahontu2912 wants to merge 2 commits intodotnet:mainfrom
alinpahontu2912:fix/remove-ubuntu-2004-eol
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Update CI pipeline from Ubuntu 20.04 (EOL) to Ubuntu 26.04#1552
alinpahontu2912 wants to merge 2 commits intodotnet:mainfrom
alinpahontu2912:fix/remove-ubuntu-2004-eol

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Fixes #1551

Replace Ubuntu 20.04 container image and apt sources with Ubuntu 26.04:

  • Container image: prereqs:ubuntu-20.04-* -> prereqs:ubuntu-26.04
  • MS packages apt source: ubuntu/20.04 -> ubuntu/26.04
  • Kitware apt source: focal -> resolute

alinpahontu2912 and others added 2 commits March 18, 2026 11:19
Replace Ubuntu 20.04 container image and apt sources with Ubuntu 26.04:
- Container image: prereqs:ubuntu-20.04-* -> prereqs:ubuntu-26.04
- MS packages apt source: ubuntu/20.04 -> ubuntu/26.04
- Kitware apt source: focal -> resolute

Fixes dotnet#1551

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
- Docker image tag ubuntu-26.04 does not exist in MCR, use ubuntu-24.04
- Kitware apt codename resolute is invalid, use noble (24.04 LTS)
- Microsoft packages URL ubuntu/26.04 does not exist, use 24.04

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Remove Ubuntu 20.04 container image from CI pipeline — EOL

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