Comment 43 for bug 1654600

Test performed for verification-done for :
 - Xenial
 - Yakkety
 - Zesty
1) Installed unattended-upgrades from -proposed
2) Verified the status of the unattended-upgrades service. All displayed :

# systemctl status unattended-upgrades
● unattended-upgrades.service - Unattended Upgrades Shutdown
   Loaded: loaded (/lib/systemd/system/unattended-upgrades.service; enabled; vendor preset: enabled)
   Active: active (exited) since Fri 2017-04-28 14:02:35 CEST; 47s ago
     Docs: man:unattended-upgrade(8)

3) Enabled Unattended-Upgrade::InstallOnShutdown "true"; in /etc/apt/apt.conf.d/50unattended-upgrades and rebooted. All releases applied the upgradeable packages upon reboot (some had too many and the timeout ran out before end of update)

4) Ran apt -y dist-upgrade on all releases. Rebooted. systems rebooted normally.

5) Enabled trusty-proposed on a Trusty system and ran do-release-upgrade to go to Xenial. After completion of the full upgrade, unattended-upgrades service was active (as seen in #2)

6) Enabled zesty-proposed on a system with /var as a separate file system. Upgraded unattended-upgrades. After upgrade, unattended-upgrades service was active (as seen in #2)

7) Verified that the workaround for Debian Bug #809669 left the upgraded system in an adequate configuration :

cat /var/lib/systemd/deb-systemd-helper-enabled/unattended-upgrades.service.dsh-also
/etc/systemd/system/multi-user.target.wants/unattended-upgrades.service

# find /etc/systemd | grep unatt
/etc/systemd/system/multi-user.target.wants/unattended-upgrades.service