[Bug 1871145] Re: apt.Cache.clear() -> apt.Cache._depcache.init() raises Error

[Balint Reczey]

Unattended-upgrades may handle this exception by exiting with failure
and not re-raising it to the top.

** Changed in: unattended-upgrades (Ubuntu)
       Status: Opinion => Triaged

** Changed in: unattended-upgrades (Ubuntu)
   Importance: Undecided => Low

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Title:
  apt.Cache.clear() -> apt.Cache._depcache.init() raises Error

Status in python-apt package in Ubuntu:
  Opinion
Status in unattended-upgrades package in Ubuntu:
  Triaged

Bug description:
  Unattended-upgrades 2.1 triggers the following crash in python-apt:

    File "/usr/bin/unattended-upgrade", line 1706, in try_to_upgrade
      cache.mark_upgrade_adjusted(pkg, from_user=not pkg.is_auto_installed)
    File "/usr/bin/unattended-upgrade", line 438, in mark_upgrade_adjusted
      self.call_adjusted(apt.package.Package.mark_upgrade, pkg, **kwargs)
    File "/usr/bin/unattended-upgrade", line 397, in call_adjusted
      self.clear()
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 700, in clear
      self._depcache.init()
  apt_pkg.Error: E:The package intellij-idea-ultimate needs to be reinstalled, but I can't find an archive for it.

  I think .clear() should not raise an error, but if it should u-u can
  catch that.

  ---

  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/798f1ab5a4a2784a0fadd6034a875901345682f9 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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