[NETSDKE2E]Libicu package dependency issue with .NET 8.0 and 9.0 May 2025 Update builds on Ubuntu25.04

[NicoleWang001]

Describe the bug

A clear and concise description of what the bug is.
Installing .NET May update builds with deb installer on Ubuntu 25.04 will return dependency problems as libicu is not installed.

To Reproduce

Try to install .NET 8.0/9.0 May update SDK via .deb on Ubuntu 25.04

Exceptions (if any)

It will return dependency problems as libicu is not installed.

Note

1. .NET 8.0 and 9.0 May 2025 update .deb installers could be installed successfully on Ubuntu 24.04
2. Similar issue https://github.com/dotnet/sdk/issues/40506-[NETSDKE2E]Libicu package dependency issue on Ubuntu24.04

[marcpopMSFT]

@leecow do we even ship these .deb packages with support for Ubuntu25.04?
@NicoleWang001 can you confirm this only repros for 25.04? We believe that package was updated for 25.04 and it makes sense this would break.

[NicoleWang001]

Yes, this issue is only repro on Ubuntu 25.04, not repro on Ubuntu 24.04

[leecow]

The only in-support versions of Ubuntu that our .debs work on are 20.04 and 22.04. See https://github.com/dotnet/core/blob/main/linux.md#microsoft-packages. The general rule is when a distro begins publishing native installers, we stop publishing to packages.microsoft.com.