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Fix/remove ubuntu 2004 eol#1553

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alinpahontu2912 wants to merge 5 commits intodotnet:mainfrom
alinpahontu2912:fix/remove-ubuntu-2004-eol
Open

Fix/remove ubuntu 2004 eol#1553
alinpahontu2912 wants to merge 5 commits intodotnet:mainfrom
alinpahontu2912:fix/remove-ubuntu-2004-eol

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Use correct ubuntu versions

alinpahontu2912 and others added 5 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>
Ubuntu 20.04 reached end-of-life in April 2025. Update:
- Container image to prereqs:ubuntu-26.04
- MS packages apt source to ubuntu/26.04
- Kitware apt source codename to resolute (26.04)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
The unqualified 'ubuntu-26.04' tag does not exist in MCR. Unlike older
Ubuntu versions, 26.04 only has architecture-qualified tags.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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