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

[Julian Andres Klode]

That backtracr is something completely different. So what is this about,
the locking failure or the resolver? Resolver failures are probably not
going to be fixable, or only with guessing and extreme caution.

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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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