[Bug 2122356] [NEW] New upstream microrelease .NET 8.0.120/8.0.20

[Dominik Viererbe]

Public bug reported:

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: TO BE PUBLISHED
   - release announcement: TO BE PUBLISHED
   - .NET 9.0.8 Runtime release notes: TO BE PUBLISHED
   - .NET 8.0.119 SDK release notes: TO BE PUBLISHED
   - .NET 8.0.19 Runtime changes: TO BE PUBLISHED

 * 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: TO BE PUBLISHED

* 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/

** Affects: dotnet8 (Ubuntu)
     Importance: Medium
     Assignee: Dominik Viererbe (dviererbe)
         Status: In Progress

** Affects: dotnet8 (Ubuntu Jammy)
     Importance: Medium
     Assignee: Dominik Viererbe (dviererbe)
         Status: In Progress

** Affects: dotnet8 (Ubuntu Noble)
     Importance: Medium
     Assignee: Dominik Viererbe (dviererbe)
         Status: In Progress

** Affects: dotnet8 (Ubuntu Plucky)
     Importance: Medium
     Assignee: Dominik Viererbe (dviererbe)
         Status: In Progress

** Affects: dotnet8 (Ubuntu Questing)
     Importance: Medium
     Assignee: Dominik Viererbe (dviererbe)
         Status: In Progress

** Also affects: dotnet8 (Ubuntu Plucky)
   Importance: Undecided
       Status: New

** Also affects: dotnet8 (Ubuntu Questing)
   Importance: Undecided
       Status: New

** Also affects: dotnet8 (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Also affects: dotnet8 (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Changed in: dotnet8 (Ubuntu Jammy)
       Status: New => In Progress

** Changed in: dotnet8 (Ubuntu Noble)
       Status: New => In Progress

** Changed in: dotnet8 (Ubuntu Plucky)
       Status: New => In Progress

** Changed in: dotnet8 (Ubuntu Questing)
       Status: New => In Progress

** Changed in: dotnet8 (Ubuntu Jammy)
   Importance: Undecided => Medium

** Changed in: dotnet8 (Ubuntu Noble)
   Importance: Undecided => Medium

** Changed in: dotnet8 (Ubuntu Plucky)
   Importance: Undecided => Medium

** Changed in: dotnet8 (Ubuntu Questing)
   Importance: Undecided => Medium

** Changed in: dotnet8 (Ubuntu Jammy)
     Assignee: (unassigned) => Dominik Viererbe (dviererbe)

** Changed in: dotnet8 (Ubuntu Noble)
     Assignee: (unassigned) => Dominik Viererbe (dviererbe)

** Changed in: dotnet8 (Ubuntu Questing)
     Assignee: (unassigned) => Dominik Viererbe (dviererbe)

** Changed in: dotnet8 (Ubuntu Plucky)
     Assignee: (unassigned) => Dominik Viererbe (dviererbe)

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https://bugs.launchpad.net/bugs/2122356

Title:
  New upstream microrelease .NET 8.0.120/8.0.20

Status in dotnet8 package in Ubuntu:
  In Progress
Status in dotnet8 source package in Jammy:
  In Progress
Status in dotnet8 source package in Noble:
  In Progress
Status in dotnet8 source package in Plucky:
  In Progress
Status in dotnet8 source package in Questing:
  In Progress

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: TO BE PUBLISHED
     - release announcement: TO BE PUBLISHED
     - .NET 9.0.8 Runtime release notes: TO BE PUBLISHED
     - .NET 8.0.119 SDK release notes: TO BE PUBLISHED
     - .NET 8.0.19 Runtime changes: TO BE PUBLISHED

   * 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: TO BE PUBLISHED

  * 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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