Update Ubuntu install documentation (Ubuntu 24.04 LTS Noble Numbat - Cycle)

[dviererbe]

Summary

• Microsoft package repository:
  • stops shipping .NET staring with Ubuntu 24.04 (see https://github.com/dotnet/core/discussions/9258)
• .NET backports package repository (https://launchpad.net/~dotnet/+archive/ubuntu/backports):
  • add support information
  • list supported versions
  • add (un)install instructions
  • add & change troubleshooting instructions
• Update outdated ARM information
• Update IBM System Z platform support infromation
• Update Dependencies:
  • add ca-certificates (see https://bugs.launchpad.net/ubuntu/+source/dotnet6/+bug/2057982 & https://github.com/dotnet/sdk/issues/39544)
  • change libicu to version 74 for Ubuntu 24.04+ (see https://launchpad.net/ubuntu/noble/+source/icu)

---

Internal previews

📄 File	🔗 Preview link
docs/core/install/linux-package-mixup.md	Troubleshoot .NET errors related to missing files on Linux
docs/core/install/linux-ubuntu-install.md	[.NET 8](#tab/dotnet8)
docs/core/install/linux-ubuntu.md	Get OS version info

[dviererbe]

Force pushed to fix linting errors and do minor fixup.

[MichaelSimons]

FYI @richlander, @NikolaMilosavljevic

[richlander]

LGTM

Thanks! This is great to see.

There must be an include somewhere that is causing this misleading text with MS to show.

In a future revision, I'd like to remove all those dependency lists from the install docs and move them elsewhere. We should make every effort to simplify these docs. That is not today and thanks for updating them!

I noticed a glitch in "[R|r]untime" and "command[s]".

Look carefully at .NET 8

And then .NET 6

I realize that these are not related to the PR. I'm noticing them for the first time with the new version widget we have, which makes this type of inspection much easier.

[richlander]

@adegeo -- Is it possible to get this PR merged and live for tomorrow? We'd like it to be live for Ubuntu 24.04 launch, which (AFAIK) is 4/25.

[adegeo]

Sounds good. I'll follow up with fixes for any nits I find. Content looks great though! Thanks @dviererbe

[richlander]

Great. Can we push to live either today or in the morning?

[adegeo]

That happens automatically overnight or tomorrow morning, I can't remember which. We can force it at early afternoon if for some reason it didn't do it.

[adegeo]

Well it created the PR but didn't merge automatically, so I just merged it. Give it <30 and it will be live.

[richlander]

Thanks!