[Bug 2122356] Re: [SRU] New upstream microrelease .NET 8.0.120/8.0.20

[Dominik Viererbe]

8.0.120-8.0.20-0ubuntu1 (questing):
- build in -proposed
- installable
- autopkgtest pass:
  * amd64: https://autopkgtest.ubuntu.com/results/autopkgtest-questing/questing/amd64/d/dotnet8/20250910_183048_3e4aa@/log.gz
  * arm64: https://autopkgtest.ubuntu.com/results/autopkgtest-questing/questing/arm64/d/dotnet8/20250910_183739_2d9d2@/log.gz
  * ppc64el: https://autopkgtest.ubuntu.com/results/autopkgtest-questing/questing/ppc64el/d/dotnet8/20250911_105845_db7dc@/log.gz
  * s390x: https://autopkgtest.ubuntu.com/results/autopkgtest-questing/questing/s390x/d/dotnet8/20250910_182850_2d9d2@/log.gz

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Title:
  [SRU] New upstream microrelease .NET 8.0.120/8.0.20

Status in dotnet8 package in Ubuntu:
  Fix Released
Status in dotnet8 source package in Jammy:
  Fix Committed
Status in dotnet8 source package in Noble:
  Fix Committed
Status in dotnet8 source package in Plucky:
  Fix Committed
Status in dotnet8 source package in Questing:
  Fix Released

Bug description:
  This is the tracking bug for the .NET 8 September 2025 release.

  [Impact]

   * This correspond to an upstream microrelease released on September 9th, 2025. See also:
     - .NET blog entry: https://devblogs.microsoft.com/dotnet/dotnet-and-dotnet-framework-september-2025-servicing-updates/
     - release announcement: https://github.com/dotnet/source-build/discussions/5334
     - .NET 8.0.10 Runtime release notes: https://github.com/dotnet/core/blob/main/release-notes/8.0/8.0.20/8.0.20.md
     - .NET 8.0.120 SDK release notes: https://github.com/dotnet/core/blob/main/release-notes/8.0/8.0.20/8.0.120.md
     - .NET 8.0.20 Runtime changes: https://github.com/dotnet/runtime/issues?q=milestone%3A8.0.20%20is%3Aclosed%20label%3Aservicing-approved
     - .NET 8.0.10 ASP.NET Core Runtime changes: https://github.com/dotnet/aspnetcore/issues?q=milestone%3A8.0.20%20is%3Aclosed%20label%3Aservicing-approved

   * It is beneficial for our LTS users to have access to the latest
  .NET stack.

  [Test Case]

   * The package should build successfully in -proposed (respectively).

   * The packages should be installable on jammy, noble, plucky, questing on
     amd64, arm64, s390x and ppc64el architectures.

   * Autopackage tests should pass.

  [Regression Potential]

   * The dotnet8 package has no reverse dependencies.

   * The upstream testing routine is usually satisfactory (see for
  example Microsoft's public Azure Pipeline for .NET related
  repositories: https://dev.azure.com/dnceng-public/public/_build), but
  there is always a risk of something breaking.

  [Other]

  * The tarball originated from here:
  https://github.com/canonical/dotnet-source-build-
  security/actions/runs/17559094225

  * 8.0.20 is the version number of the .NET Runtime and 8.0.120 is the version
    number of the .NET SDK.

  * We are only building the 8.0.1xx feature band, because this is the only
    feature band that allows building from source. See explanation of feature
    bands: https://learn.microsoft.com/en-us/dotnet/core/releases-and-support#feature-bands-sdk-only

  * Overview of how dotnet is versioned: https://learn.microsoft.com/en-
  us/dotnet/core/versions/

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