[Bug 1934100] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for autopkgtest has
completed successfully and the package is now being released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1934100

Title:
  Setup Always-Include-Phased-Updates (for hirsute+)

Status in autopkgtest package in Ubuntu:
  Fix Released
Status in autopkgtest source package in Bionic:
  Fix Committed
Status in autopkgtest source package in Focal:
  Fix Committed
Status in autopkgtest source package in Hirsute:
  Fix Released
Status in autopkgtest source package in Impish:
  Fix Released

Bug description:
  [Impact]
  APT 2.2.4 and newer, in hirsute-proposed, apply phasing to non-installed packages as well, to fix bug 1925745. This causes autopkgtest to no longer retrieve source packages (apt-get source still works fine), and hence the tests to fail - example:

  https://autopkgtest.ubuntu.com/results/autopkgtest-
  hirsute/hirsute/amd64/u/ubuntu-advantage-
  tools/20210618_132205_96afa@/log.gz

  We need to change setup-testbed to set APT::Get::Always-Include-
  Phased-Updates to true, as we did on the infrastructure and merged
  upstream in https://salsa.debian.org/ci-
  team/autopkgtest/-/merge_requests/125

  We set this unconditionally, it's a no-op for older releases.

  [Test plan]
  Correctness of the APT::Get::Always-Include-Phased-Updates feature is checked by the APT test suite. We only need to validate that the correct line is being written to /etc/apt/apt.conf.d/90always-include-phased-updates.

  Run autopkgtest-build-lxd or autopkgtest-buildvm-ubuntu-cloud to
  create a new hirsute image and check that the file sets the option.

  [Where problems could occur]
  Syntax could be wrong, and hence building images could fail.

  Semantics should arguably be more correct, as Always-Include-Phased-
  Updates is the legacy apt behavior against which autopkgtest was
  developed.

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