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[Launchpad Bug Tracker <1825886@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package unattended-upgrades -
1.1ubuntu1.18.04.7~16.04.3

---------------
unattended-upgrades (1.1ubuntu1.18.04.7~16.04.3) xenial; urgency=medium

  * Detect changes to moved conffiles (LP: #1823872)
    - Add tests for checking conffile moves.
      Build depend on and use equivs to generate new test packages
    - Split() conffile data to set of names only once
    - Don't parse dpkg conffile db when there are no conffiles in the package
  * Detect unchanged moved conffiles.
    When a package moves a conffile properly without any change no conffile
    prompt needs to be shown thus the package can be upgraded unattended.
    (LP: #1823872)
  * Skip sending email when no package had to be installed, upgraded or removed
    (LP: #1821103) (Closes: #924554)
  * Make sure autoremovals don't start with a dirty cache and remove other
    packages (LP: #1824341)
  * Continue applying minimal sets when one set can't be marked for upgrade.
    Thanks to Anderson Luiz Alves for the patch, it needed minor modifications
    (LP: #1824341)
  * Stop raising NoAllowedOriginError when marking packages to upgrade/install
    fails (LP: #1824876)
  * Adjust only transitive dependencies in the fallback when a package from an
    allowed origin can't be marked to install/upgrade.
    This is a much lighter approach than marking every upgradable package
    because the full fallback was triggered on packages held back as well,
    using an excessive amount of CPU time.
    Also it crashed with packages not having any version in allowed origins.
    (LP: #1824804, #1824949)
  * Skip trying to upgrade held packages in call_adjusted() (LP: #1824804)
  * Follow all kinds of transitive dependencies when adjusting dependencies
  * 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)
    - test_rewind: Update test to check if adjustend rewinding took place
  * do_auto_remove() is successful unless a commit() operation fails
    (LP: #1795696)
  * Compare apt.package.Version objects and not the versions' string
    representation. (LP: #1820888)
    This prevented adjusting candidates when the strings sorted differently.
    Also extend tests to catch issue.
  * Fall back to adjusting more packages' candidates
    when a package from an allowed origin can't be marked to install/upgrade.
    (LP: #1821101)

 -- Balint Reczey <rbalint@xxxxxxxxxx>  Mon, 29 Apr 2019 12:23:14 +0200

** Changed in: unattended-upgrades (Ubuntu Disco)
       Status: Fix Committed => 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 Xenial:
  Fix Released
Status in unattended-upgrades source package in Bionic:
  Fix Released
Status in unattended-upgrades source package in Cosmic:
  Fix Released
Status in unattended-upgrades source package in Disco:
  Fix Released

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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