[Bug 1974223] Re: FTBFS and autopkgtest failure since changes in apt for automatic kernel removal

[Robie Basak]

What's the current status of this please?

Julian's last comment suggests that there's a problem?

I see an upload in the queue for Bionic, but not for Focal. What's the
status in Focal?

Is this something that can be staged in proposed, or do you need it in
the updates pockets, and if so, why?

** Changed in: unattended-upgrades (Ubuntu Bionic)
       Status: New => Incomplete

** Changed in: unattended-upgrades (Ubuntu Focal)
       Status: New => Incomplete

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Title:
  FTBFS and autopkgtest failure since changes in apt for automatic
  kernel removal

Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in unattended-upgrades source package in Bionic:
  Incomplete
Status in unattended-upgrades source package in Focal:
  Incomplete
Status in unattended-upgrades package in Debian:
  Fix Released

Bug description:
  [Impact]
  Since the following changes in apt have landed in focal-updates (and is currently in bionic-proposed), unattended-upgrades FTBFS and fails autopkgtest on both series:

    * Revert "Protect currently running kernel at run-time"
    * Backport Determine autoremovable kernels at run-time (LP: #1615381) as of
      2.4.5; including the change to only protect two kernels, not last installed
      one (LP: #1968154)

  ======================================================================
  FAIL: test_remove_unused_dependencies_new_unused_only (__main__.TestRemoveUnused)
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "./test_remove_unused.py", line 165, in test_remove_unused_dependencies_new_unused_only
      haystack))
  AssertionError: False is not true : Can not find 'Removing unused kernel packages: linux-image-4.05.0-1021-kvm

  [Test plan]
  1. focal:
    * run autopkgtest against -updates:
      $ autopkgtest unattended-upgrades --apt-upgrade --apt-pocket=updates --test-name run-tests -- <virt-server ...>
    * try to build the package
  2. bionic:
    * run autopkgtest against -proposed:
      $ autopkgtest unattended-upgrades --apt-upgrade --apt-pocket=proposed --test-name run-tests -- <virt-server ...>
    * try to build the package

  [Where problems could occur]
    * The fix only affects the test-suite (that runs both at build time & autopkgtest time) so the impact should be minimal. Something wrong in the patch would make the unattended package FTBFS or fail autopkgtest but it is already failing ATM.
    * The new tests dependency on apt can trigger more autopkgtest runs. Since unattended-upgrades has a non-trivial autopkgtest suite, this can have a slight impact on the queues.

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