Comment 73 for bug 1690980

@Balint

Here is test result for InstallOnShutdown:true

"Errors were encountered while processing: apport"
u-u still has packages to upgrade after this issue happens.
So, when I reboot system every time, u-u still tries to upgrade package.
We expect that there are 30 mins to do the update.
But, dependency problem will prevent u-u from upgrading packages.

1. unattended-upgrades-shutdown.log: (Please check full log as attached)
----------------
2017-09-22 14:54:25,865 WARNING - Running unattended-upgrades in shutdown mode
14:54:25~14:55:54 => 1:29, u-u only takes 1:29 to upgrade packges.
2017-09-22 14:57:02,183 WARNING - Running unattended-upgrades in shutdown mode
14:57:02~14:58:30 => 1:28
2017-09-22 15:00:00,233 WARNING - Running unattended-upgrades in shutdown mode
15:00:00~15:01:28 => 1:28
----------------

2. unattended-upgrades-dpkg.log:
----------------
Log started: 2017-09-22 14:34:24
...
Preparing to unpack .../apport_2.20.1-0ubuntu2.10_all.deb ...
Failed to get load state of apport-forward.socket: Connection reset by peer
2017-09-22 14:37:26,769 WARNING SIGTERM received, will stop
Log ended: 2017-09-22 14:37:26
----------------

Installed packages:
apt (1.2.25-rbalint2)
unattended-upgrades_0.96ubuntu1-16.04.1_all.deb