[Bug 1552792] Update Released

[Brian Murray]

The verification of the Stable Release Update for packagekit 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/1552792

Title:
  gnome software leaves dependencies installed

Status in GNOME Software:
  Invalid
Status in Release Notes for Ubuntu:
  Fix Released
Status in gnome-software package in Ubuntu:
  Fix Released
Status in packagekit package in Ubuntu:
  Fix Released
Status in gnome-software source package in Bionic:
  Fix Committed
Status in packagekit source package in Bionic:
  Fix Released
Status in gnome-software source package in Cosmic:
  Fix Released
Status in packagekit source package in Cosmic:
  Fix Released

Bug description:
  [Impact]
  Installing an application them removing it leaves dependencies behind.

  [Test Case]
  1. Ensure that GNOME Sudoku is not installed:
  $ sudo apt remove gnome-sudoku libqqwing2v5
  2. Check if you have any packages that need autoremoval:
  $ sudo apt autoremove --no-act
  3. Open GNOME Software.
  4. Search for and install GNOME Sudoku (make sure to install the .deb, not the snap).
  5. Uninstall GNOME Sudoku.
  6. Check if you have any packages that need autoremoval:
  $ sudo apt autoremove --no-act

  Expected result:
  The packages in step 6 are the same as in step 2 (which might be none).

  Observed result:
  The packages in step 6 includes libqqwing2v5, which is a dependency of gnome-sudoku and not useful without the game installed.

  [Regression Potential]
  This requires a fix to PackageKit which used to autoremove all packages (too aggressive), not just the ones related to the current transaction. A bug in the code could cause more packages to be removed than is suitable. GNOME Software previously didn't use this autoremove functionality, so by enabling it we could trigger a problem in either the existing code or the new fix.

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