[Bug 1690980] [NEW] unattended-upgrades does not block shutdown of system, as it is designed to

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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: oem-priority
     Importance: Critical
     Assignee: ethan.hsieh (ethan.hsieh)
         Status: Triaged

** Affects: oem-priority/xenial
     Importance: Critical
         Status: New

** Affects: unattended-upgrades (Ubuntu)
     Importance: Undecided
     Assignee: Balint Reczey (rbalint)
         Status: Incomplete


** Tags: patch xenial
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unattended-upgrades does not block shutdown of system, as it is designed to
https://bugs.launchpad.net/bugs/1690980
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