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[Brian Murray <brian@xxxxxxxxxx>]

** Also affects: unattended-upgrades (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1779157

Title:
  /usr/bin/unattended-upgrade:AssertionError:/usr/bin/unattended-
  upgrade@1927:main:do_install

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

Bug description:
  [Impact]

   * Unattended-upgrades can be crashing when packages are marked for removal after collecting upgradable packages.
   * The fix clear the cache when it may be in an invalid state to lose markings.

  [Test Case]

   * Observe
  https://errors.ubuntu.com/problem/66b5fef8d6dd83a7db6c494c807cfc067626c0c2
  not occurring in fixed versions.

  [Regression Potential]

   * The extra cache.clear() can take extra CPU time when invoked
  needlessly or can cause skipping updates when invoked at the wrong
  time. However the fix received extensive testing in newer releases
  making unnoticed regressions unlikely to surface.

  [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 1.1ubuntu1.18.04.1, the problem page at https://errors.ubuntu.com/problem/9b1b98279fa2b503abb1b1b69bec0cabf647be0c 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/.

  Traceback

  Traceback (most recent call last):
    File "/usr/bin/unattended-upgrade", line 1927, in <module>
      sys.exit(main(options))
    File "/usr/bin/unattended-upgrade", line 1782, in main
      logfile_dpkg)
    File "/usr/bin/unattended-upgrade", line 1057, in do_install
      "removal:%s" % "".join([pkg.name for pkg in marked_delete]))
  AssertionError: Internal error. The following packages are marked for removal:linux-headers-4.15.0-20-generic

  Also seen as:
  https://errors.ubuntu.com/problem/733d2e7865692e215f406231edd3692a6a1810c5

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