[Bug 1770224] [NEW] unattended-upgrades crashes with: apt_pkg.Error: E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages

[errors.ubuntu.com bug bridge]

Public bug reported:

It seems pkgProblemResolver is hitting an internal bug quite frequently
with latest u-u:

Traceback (most recent call last):
  File "/usr/bin/unattended-upgrade", line 1927, in <module>
    sys.exit(main(options))
  File "/usr/bin/unattended-upgrade", line 1822, in main
    options.dry_run)
  File "/usr/bin/unattended-upgrade", line 1399, in do_auto_remove
    res, error = cache_commit(cache, logfile_dpkg, verbose)
  File "/usr/bin/unattended-upgrade", line 513, in cache_commit
    res = cache.commit(install_progress=iprogress)
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 565, in commit
    res = self._fetch_archives(fetcher, pm)
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 385, in _fetch_archives
    raise LockFailedException("Failed to lock %s" % lockfile)
apt.cache.LockFailedException: Failed to lock /var/cache/apt/archives/lock


I believe this should be fixed in apt rather than just catching it in u-u.

More info:

The Ubuntu Error Tracker has been receiving reports about a problem regarding unattended-upgrades.  This problem was most recently seen with package version 1.1ubuntu1, the problem page at https://errors.ubuntu.com/problem/49de8d44b4ceccb27b66921173ee7e837e7a1e54 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/.

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bionic

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https://bugs.launchpad.net/bugs/1770224

Title:
  unattended-upgrades crashes with: apt_pkg.Error: E:Error,
  pkgProblemResolver::Resolve generated breaks, this may be caused by
  held packages

Status in apt package in Ubuntu:
  New

Bug description:
  It seems pkgProblemResolver is hitting an internal bug quite
  frequently with latest u-u:

  Traceback (most recent call last):
    File "/usr/bin/unattended-upgrade", line 1927, in <module>
      sys.exit(main(options))
    File "/usr/bin/unattended-upgrade", line 1822, in main
      options.dry_run)
    File "/usr/bin/unattended-upgrade", line 1399, in do_auto_remove
      res, error = cache_commit(cache, logfile_dpkg, verbose)
    File "/usr/bin/unattended-upgrade", line 513, in cache_commit
      res = cache.commit(install_progress=iprogress)
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 565, in commit
      res = self._fetch_archives(fetcher, pm)
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 385, in _fetch_archives
      raise LockFailedException("Failed to lock %s" % lockfile)
  apt.cache.LockFailedException: Failed to lock /var/cache/apt/archives/lock

  
  I believe this should be fixed in apt rather than just catching it in u-u.

  More info:

  The Ubuntu Error Tracker has been receiving reports about a problem regarding unattended-upgrades.  This problem was most recently seen with package version 1.1ubuntu1, the problem page at https://errors.ubuntu.com/problem/49de8d44b4ceccb27b66921173ee7e837e7a1e54 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/.

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