[Bug 1918920] Autopkgtest regression report (apt/1.6.13)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted apt (1.6.13) for bionic have finished running.
The following regressions have been reported in tests triggered by the package:

apport/2.20.9-0ubuntu7.23 (amd64, i386)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/bionic/update_excuses.html#apt

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/1918920

Title:
  Harden test for no new acquires after transaction abort

Status in apt package in Ubuntu:
  Fix Committed
Status in apt source package in Bionic:
  Fix Committed
Status in apt source package in Focal:
  Fix Committed
Status in apt source package in Groovy:
  Fix Committed

Bug description:
  [Impact]
  test-pdiff-usage is somewhat flaky, especially on Debian, this makes it less flaky. No end user impact as it's a test-only change.

  [Test plan]
  Running autopkgtest, which runs our extensive integration test suite which includes the changed test.

  [Where problems could occur]
  No end user regression potential on its own, but might slightly change regression potential for future pdiff changes:

  Test approach is slightly different now. It still catches that updates
  fail correctly, but tests more concretely that a transaction was
  aborted rather than that no worker received work (which was not
  guaranteed, the work could be scheduled before it was aborted).

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