[Expired for python-apt (Ubuntu) because there has been no activity for
60 days.]

** Changed in: python-apt (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1871149

Title:
  False apt_pkg.CacheMismatchError

Status in python-apt package in Ubuntu:
  Expired

Bug description:
  Python-apt throws CacheMismatchError which is almost certainly false:

  Traceback (most recent call last):
    File "/usr/bin/unattended-upgrade", line 2512, in <module>
      sys.exit(main(options))
    File "/usr/bin/unattended-upgrade", line 1986, in main
      res = run(options, rootdir, mem_log, logfile_dpkg,
    File "/usr/bin/unattended-upgrade", line 2398, in run
      new_pending_autoremovals = get_auto_removable(cache)
    File "/usr/bin/unattended-upgrade", line 1789, in get_auto_removable
      return {pkg.name for pkg in cache
    File "/usr/bin/unattended-upgrade", line 1790, in <setcomp>
      if pkg.is_auto_removable}
    File "/usr/lib/python3/dist-packages/apt/package.py", line 1269, in 
is_auto_removable
      self._pcache._depcache.is_garbage(self._pkg))
  apt_pkg.CacheMismatchError: Object of different cache passed as argument to 
apt_pkg.DepCache method

  The relevant code in u-u:

  def get_auto_removable(cache):                                                
                                                                                
                
      # type: (apt.Cache) -> AbstractSet[str]                                   
                                                                                
                
      return {pkg.name for pkg in cache                                         
                                                                                
                
              if pkg.is_auto_removable}

  ---

  The Ubuntu Error Tracker has been receiving reports about a problem 
  regarding unattended-upgrades.  This problem was most recently seen with 
package version 2.1, the problem page at 
https://errors.ubuntu.com/problem/ff08f6aa104f8e3233da3081835ecc2e9f0452f5 
contains more details, including versions of packages affected, stacktrace or 
traceback, and individual crash reports.
  If you do not have access to the Ubuntu Error Tracker and are a software 
developer, you can request it at http://forms.canonical.com/reports/.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/python-apt/+bug/1871149/+subscriptions

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