[Bug 1918920] Update Released

[Brian Murray]

The verification of the Stable Release Update for apt 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/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 Released

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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