[Bug 2122355] Re: [SRU] New upstream microrelease .NET 9.0.110/9.0.9

[Dominik Viererbe]

9.0.110-9.0.9-0ubuntu1 (questing):
- build in -proposed
- installable
- autopkgtest pass:
  * amd64: https://autopkgtest.ubuntu.com/results/autopkgtest-questing/questing/amd64/d/dotnet9/20250910_024209_d013a@/log.gz
  * arm64: https://autopkgtest.ubuntu.com/results/autopkgtest-questing/questing/arm64/d/dotnet9/20250910_043241_77f8e@/log.gz
  * ppc64el: https://autopkgtest.ubuntu.com/results/autopkgtest-questing/questing/ppc64el/d/dotnet9/20250911_074954_8c2ba@/log.gz
  * s390x: https://autopkgtest.ubuntu.com/results/autopkgtest-questing/questing/s390x/d/dotnet9/20250911_063440_4e382@/log.gz

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https://bugs.launchpad.net/bugs/2122355

Title:
  [SRU] New upstream microrelease .NET 9.0.110/9.0.9

Status in dotnet9 package in Ubuntu:
  Fix Released
Status in dotnet9 source package in Plucky:
  Fix Committed
Status in dotnet9 source package in Questing:
  Fix Released

Bug description:
  This is the tracking bug for the .NET 9 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/5333
     - .NET 9.0.9 Runtime release notes: https://github.com/dotnet/core/blob/main/release-notes/9.0/9.0.9/9.0.9.md
     - .NET 9.0.110 SDK release notes: https://github.com/dotnet/core/blob/main/release-notes/9.0/9.0.9/9.0.110.md
     - .NET 9.0.9 Runtime changes: https://github.com/dotnet/runtime/issues?q=milestone%3A9.0.9%20is%3Aclosed%20label%3Aservicing-approved
     - .NET 9.0.9 ASP.NET Core Runtime changes: https://github.com/dotnet/runtime/issues?q=milestone%3A9.0.9%20is%3Aclosed%20label%3Aservicing-approved

   * It is beneficial for our 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 plucky, questing on
     amd64, arm64, s390x and ppc64el architectures.

   * Autopackage tests should pass.

  [Regression Potential]

   * The dotnet9 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/17559116547

  * 9.0.9 is the version number of the .NET Runtime and 9.0.110 is the version
    number of the .NET SDK.

  * We are only building the 9.0.1xx 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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