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https://bugs.launchpad.net/bugs/1690980

Title:
  unattended-upgrades does not block shutdown of system, as it is
  designed to

Status in OEM Priority Project:
  Triaged
Status in OEM Priority Project xenial series:
  Triaged
Status in apt package in Ubuntu:
  Fix Released
Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in apt source package in Xenial:
  Fix Released
Status in unattended-upgrades source package in Xenial:
  New
Status in apt source package in Zesty:
  Won't Fix
Status in unattended-upgrades source package in Zesty:
  Won't Fix

Bug description:
  Title: No pop-up window to warn users that system should not reboot or
  shutdown while installing security updates

  Summary:
  No pop-up window to warn users that system should not reboot or shutdown 
while installing security updates

  Steps:
  1. trigger unattended-upgrades
  2. reboot or shutdown system while installing packages

  Expected results: There is a pop-up window to warn users that system
  should not reboot or shutdown

  Actual results: There is no pop-up window to warn users

  Additional information:
  $ apt-cache policy unattended-upgrades
  unattended-upgrades:
    Installed: 0.90
    Candidate: 0.90ubuntu0.5
  $ lsb_release -rd
  Description:    Ubuntu 16.04 LTS

  
  * APT SRU *
  [Impact]
  Stopping apt-daily-upgrade.service terminates dpkg and friends by sending the 
signals to all processes in the cgroup, and will send KILL quickly after.

  [Test case]
  Start apt-daily-upgrade.service and stop it while unattended-upgrades is 
running.

  The upgrade should run to completion or a safe exit point as long as
  it takes less than about 900s (which is the timeout for sending kill).

  [Regression potential]
  Leftover processes might remain in the apt-daily-upgrade cgroup if the 
postinst scripts or some apt hooks do something funny.

  Shutdown might take longer due to the 900 second timeout.

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