[Bug 1820886] Update Released

[Brian Murray]

The verification of the Stable Release Update for apt 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/1820886

Title:
  Potential inconsistency due to system halt/reboot being allowed when
  package installation in progress

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Xenial:
  In Progress
Status in apt source package in Bionic:
  In Progress
Status in apt source package in Cosmic:
  In Progress
Status in apt source package in Disco:
  Fix Released

Bug description:
  [System]
  Any current Ubuntu Desktop/Server supported release (Trusty, Xenial, Bionic, Cosmic).

  [Impact]
  Package installation turns into an inconsistent state if system is rebooted in the middle of an apt install/upgrade.

  [Test Case]
  1. User1 at Ubuntu box issues "sudo apt-get upgrade";
  2. User2 at Ubuntu box issues "shutdown -r" or reboots it using the GUI;
  3. System reboots and potentially turns into an inconsistent state.

  [Remarks]
  APT should automatically inhibit system halts/reboots while packages being installed/removed. A similar behavior to what is shown by unattended-upgrades.

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