In xenial and yakkety, unattended-upgrade can finish security updates
after applying workaround 1&2.

workaround 3: If users reboot/shutdown by UI, there will be a pop-up window 
which asks users for root password.
If users reboot/shutdown by command (sudo reboot), unattended-upgrade will be 
killed and cannot finish security updates.

Workaround 1:
/lib/systemd/system/apt-daily.service
[Service]
Type=oneshot
ExecStart=/usr/lib/apt/apt.systemd.daily
+KillMode=none
+TimeoutStopSec=0

Wordaround 2:
/lib/systemd/system/apt-daily.service
[Unit]
Description=Daily apt activities
Documentation=man:apt(8)
+DefaultDependencies=no
+Before=shutdown.target

Workaround 3:
/lib/systemd/system/apt-daily.service
[Service]
Type=oneshot
-ExecStart=/usr/lib/apt/apt.systemd.daily
+ExecStart=/bin/systemd-inhibit --what=shutdown --mode=block 
/usr/lib/apt/apt.systemd.daily

---
the code flow of unattended-upgrades:
(1) -> apt_pkg.get_lock() -> do_install() -> (2)

If users reboot/shutdown system in (1), unattended-upgrades-shutdown
will break from monitoring loop and then there will no message to tell
user that security update is ongoing.

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

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

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