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https://bugs.launchpad.net/bugs/1775226

Title:
  [SRU] Gnome Software offers installation of updates on shutdown
  independently from update-manager and unattended-upgrades

Status in gnome-software package in Ubuntu:
  Fix Released
Status in gnome-software source package in Bionic:
  Fix Released

Bug description:
  [Original Description]

  In Ubuntu the GUI for upgrading packages is update-manager allowing
  debconf questions to be answered when needed and Ubuntu also offers
  unattended-upgrades for upgrading packages in the background and it
  keeps back packages from upgrading when configuration-file changes
  would need user interaction during the upgrade. Unattended-upgrades
  can be configured to perform upgrades during system shutdown.

  Gnome Software in Bionic started offering performing upgrades during
  shutdown using PackageKit independently from update-manager and
  unattended-upgrades without offering all of the features of either
  one.

  Unless there is a decision to fully switch to Gnome Software I suggest
  disabling the "Install pending software updates" on the shutdown
  screen to avoid confusing users.

  
  [Impact]

  As stated in the original description, users may be confused by the
  checkbox on the shutdown dialog offering to install updates,
  considering that all updates in Ubuntu are currently handled by a
  separate GUI (update-manager).

  This is fixed in cosmic (3.29.1-0ubuntu6) by disabling offline updates
  in the packagekit refresh plugin.

  The fix is trivial and complements an existing patch that was already
  disabling updates in gnome-software.

  
  [Test Case]

  0) Prerequisite: a bionic system not fully up-to-date (if yours is fully 
up-to-date, downgrade a package)
  1) Verify that the following file doesn't exist (if it does, remove it): 
/var/lib/PackageKit/prepared-update
  2) Open gnome-software
  3) Click on the "Updates" tab, and click the refresh button in the top-left 
corner
  4) Wait for the refresh operation to be complete (gnome-software might 
incorrectly report that there are no updates available, this is a separate 
issue, bug #1709725)
  5) Wait a minute or two to ensure there are no pending packagekit async tasks
  6) Verify that /var/lib/PackageKit/prepared-update still doesn't exist, and 
consequently, when requesting to shut down the computer, the shutdown dialog 
doesn't offer a "Install pending software updates" checkbox

  
  [Regression Potential]

  gnome-software is not used to install updates (from the archive) on
  Ubuntu. However firmware updates and updates from other packaging
  systems (such as flatpak) should still appear in the updates tab, when
  available.

  
  [Other Info]

  The updates tab in gnome-software may claim that there are no updates
  available, when in fact there are. This is also confusing, but is a
  separate issue (bug #1709725) and will be addressed separately.

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