[Bug 1825886] Re: Unattended-upgrades may crash when a package does not have a candidate

[Launchpad Bug Tracker]

This bug was fixed in the package unattended-upgrades - 1.12ubuntu1

---------------
unattended-upgrades (1.12ubuntu1) eoan; urgency=medium

  * Don't crash collecting transitive dependencies when package has no candidate
    (LP: #1825886)
  * Use mark_install_adjusted() in rewind_cache()
    The original cache had packages marked with adjustments thus rewinding
    should also do adjustments to reach the same state.
    Also not using mark_install_adjusted() crashes when apt raises error on
    held packages. (LP: #1826157)

 -- Balint Reczey <rbalint at ubuntu.com>  Fri, 26 Apr 2019 14:33:08 +0200

** Changed in: unattended-upgrades (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1825886

Title:
  Unattended-upgrades may crash when a package does not have a candidate

Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in unattended-upgrades source package in Bionic:
  New
Status in unattended-upgrades source package in Cosmic:
  New
Status in unattended-upgrades source package in Disco:
  New

Bug description:
  [Impact]

   * Unattended-upgrades may crash when a package in apt's cache does not have a candidate and it is visited when finding packages to adjust.
   * The crash occurs when apt.Package.candidate is None and the fix is checking if .candidate is truthy and it that case is safe to reference the .dependencies attribute.

  [Test Case]

   * Watch the error not happening anymore.

  [Regression Potential]

   * The fix is very small and is not likely to cause any regression.

  [Original Bug Text]

  The Ubuntu Error Tracker has been receiving reports about a problem regarding unattended-upgrades.  This problem was most recently seen with package version 1.10ubuntu5, the problem page at https://errors.ubuntu.com/problem/0d08f995622277f81d276f1eae7e1a722e3627de 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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