[Bug 1821376] Update Released

[Brian Murray]

The verification of the Stable Release Update for unattended-upgrades
has completed successfully and the package is now being 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/1821376

Title:
  Report packages kept back by origins

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 Disco:
  Fix Released

Bug description:
  [Impact]

  * Packages kept back are listed in the email report, but it is not
  clear from which origins they are installable. This information may
  help administrators to decide if the packages need to be manually
  upgraded.

  [Test Case]

  * test_mail.py test is updated to check if the kept back packages are
  reported per origin and this is checked at build time.

  *  For manual testing:
    1. Configure u-u to allow upgrades from the -updates pocket and send email with the upgrade report.
    2. Set up the system to have a few packages upgradable from both the -security and -updates pockets.
    3. Mark a subset of packages which are upgradable as held, marking packages from each of the pockets.
    4. Run u-u and observe the kept packages listed in the email. Each package is listed only in the allowed origin providing the highest version. (LP: #1848697 covers listing them in all origins from which the packages could be upgraded to.)

  [Regression Potential]

  * Unattended upgrades may crash while trying to perform updates or
  while trying to send the summary email. Build-time tests and
  autopkgtests include testing both functions.

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