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

[Balint Reczey]

IMO the proper fix involves several changes which I collected in this GitHub branch to be merged
to upstream:
https://github.com/rbalint/unattended-upgrades/commits/lock-handling

Since the changes are extensive I would prefer merging them upstream,
releasing them to sid, then Artful, and then they can be backported to
Xenial and other releases. It looks like to me that more code needs to
be backported than half of the delta between releases thus I propose
SRU-s practically syncing latest unattended-updates to supported
releases.

Testing of the new code is appreciated, but please let u-u be triggered
by the apt-daily* timers because sudo does not protect u-u from being
killed as Ethan pointed out in #25.

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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:
  New
Status in unattended-upgrades package in Ubuntu:
  Incomplete

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

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