[Bug 1690980] [NEW] No pop-up window to warn users that system should not reboot or shutdown while installing security updates

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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

** Affects: unattended-upgrades (Ubuntu)
     Importance: Undecided
         Status: New

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No pop-up window to warn users that system should not reboot or shutdown while installing security updates
https://bugs.launchpad.net/bugs/1690980
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