[Bug 1924809] Re: apt 2.0.5 in focal causes autopkgtest failures for update-manager

[Brian Murray]

Using the update_excuses report as a reference we can see the test pass
for Focal.

update-manager (1:20.04.10.6 to 1:20.04.10.7)

    Migration status for update-manager (1:20.04.10.6 to 1:20.04.10.7): BLOCKED: Needs an approval (either due to a freeze, the source suite or a manual hint)
    Issues preventing migration:
    Not touching package due to block request by freeze (please contact ubuntu-release if update is needed)
    Additional info:
    0 days old

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https://bugs.launchpad.net/bugs/1924809

Title:
  apt 2.0.5 in focal causes autopkgtest failures for update-manager

Status in update-manager package in Ubuntu:
  In Progress
Status in update-manager source package in Focal:
  Fix Committed
Status in update-manager source package in Groovy:
  Fix Committed
Status in update-manager source package in Hirsute:
  Fix Committed

Bug description:
  ======================================================================
  ERROR: Test that updates from the security node go in
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/tmp/autopkgtest.0o0kua/build.B7h/src/tests/test_update_list.py", line 30, in setUp
      self.cache = MyCache(apt.progress.base.OpProgress(),
    File "/tmp/autopkgtest.0o0kua/build.B7h/src/UpdateManager/Core/MyCache.py", line 70, in __init__
      apt.Cache.__init__(self, progress, rootdir)
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 170, in __init__
      self.open(progress)
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 232, in open
      self._cache = apt_pkg.Cache(progress)
  apt_pkg.Error: W:Unable to read /tmp/autopkgtest.0o0kua/build.B7h/src/tests/aptroot-update-list-test/etc/apt/preferences.d/ - DirectoryExists (2: No such file or directory), E:Regex compilation error - Invalid range end

  Full test results can be found here:

  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
  /autopkgtest-focal/focal/amd64/u/update-
  manager/20210416_180839_df210@/log.gz

  Downgrading apt to version 2.0.4 causes the test to pass again.

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