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[Launchpad Bug Tracker <1826870@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package python-apt -
1.1.0~beta1ubuntu0.16.04.4

---------------
python-apt (1.1.0~beta1ubuntu0.16.04.4) xenial; urgency=medium

  * apt.Cache: Fix (un)locking of archives (Closes: #922416) (LP: #1826870)
  * apt.Cache: Use explicit, more safe locking in update()
  * Update mirror lists

python-apt (1.1.0~beta1ubuntu0.16.04.3) xenial; urgency=medium

  * Frontend locking and related locking improvements (LP: #1795407)
    - apt.Cache: Keep / Re-establish the system lock in commit()
    - apt.Cache: Keep archive locked during commit()/ in fetch_archives()
    - apt.Cache: Reinstate locks in a finally / run dpkg inside try
    - Introduce frontend locking
    - Convert apt.Cache.commit and apt_pkg.DepCache.commit to FE lock
  * Other changes to make that work:
    - travis CI: enable PPA for new apt versions
  * As always, updated mirror lists

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Mon, 29 Apr 2019 14:11:32
+0200

** Changed in: python-apt (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1826870

Title:
  cache.commit() doesn't release the archives lock

Status in python-apt package in Ubuntu:
  Fix Released
Status in python-apt source package in Xenial:
  Fix Released
Status in python-apt source package in Bionic:
  Fix Released
Status in python-apt source package in Cosmic:
  Fix Released
Status in python-apt package in Debian:
  Fix Released

Bug description:
  [Impact]
  cache.commit() does not release all the locks it acquires as part of committing. This is a regression of locking fixes in bug 1795407.

  [Test case]
  This script should work:

  #!/usr/bin/env python
  import apt
  import subprocess

  cache = apt.Cache()
  pkg = cache["hello"]
  pkg.mark_install()
  cache.commit()
  subprocess.check_call(["apt", "remove", "--yes", "hello"])

  [Regression potential]
  Other new locking bugs could pop up

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