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[Launchpad Bug Tracker <1820888@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 Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1820888

Title:
  unattended-upgrades may hold back upgrades due to comparing package
  versions by their string representation

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

Bug description:
  [Impact]

   * Without the fix u-u could not upgrade particular packages from -security. It could be observed in Cosmic with systemd security updates failing to install partly due to 239-7ubuntu10.10 being smaller than 239-7ubuntu10.8 when comparing them as strings:
  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-disco/disco/amd64/u/unattended-upgrades/20190318_182031_fe4fe@/log.gz

  [Test Case]

   * The fix includes the extension of the build-time test cases to
  cover package sets with which u-u fails with without the fallback:

  ...
  Running ./test_rewind.py with python3
  DEBUG:root:APT::VersionedKernelPackages is not set
  DEBUG:root:adjusting candidate version: test-package=2.0
  ...

  With the unfixed version the test case fails here because u-u tries to
  upgrade test-package to version 12.0 because it does not find version
  2.0 smaller.

  [Regression Potential]

  * The change is very small and isolated, but fixing it revealed the
  issue fixed in LP: #1821101. Since the found issue's fix introduces
  fallbacks when apt's resolver can't find a the solution it is unlikely
  that other failures are triggered by the fix.

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