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

[Lena Voytek]

Verified PPA contents and sponsored for questing and plucky.

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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:
  In Progress
Status in dotnet9 source package in Plucky:
  In Progress
Status in dotnet9 source package in Questing:
  In Progress

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: TO BE PUBLISHED
     - release announcement: TO BE PUBLISHED
     - .NET 9.0.9 Runtime release notes: TO BE PUBLISHED
     - .NET 9.0.110 SDK release notes: TO BE PUBLISHED
     - .NET 9.0.9 Runtime changes: TO BE PUBLISHED

   * 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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