[Bug 1826157] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for unattended-upgrades
has completed successfully and the package has now been released to
-updates.  Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1826157

Title:
  unattended-upgrades: rewind_cache() may crash due to not adjusting
  package candidates

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

Bug description:
  [Impact]

   * Unattended-upgrades may crash when rewinding cache due to not adjusting package candidates before marking them to upgrade/install.
   * The fix is using adjusted marking that in effect rewinds the cache to the right, adjusted state.

  [Test Case]

   * test/test_rewind.py is updated to verify that rewinding included adjustments and it is ran during the build.
   * Also 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/6f57d938f3aa56b3995d5bccf4637d65734d78e4 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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