Comment 34 for bug 1778219

Verified 1.1ubuntu1.18.04.7~16.04.2 on Xenial:

root@x-uu:~# dbus-send --system --print-reply --dest=org.freedesktop.login1 /org/freedesktop/login1 "org.freedesktop.login1.Manager.Reboot" boolean:false
method return time=1554982311.759518 sender=:1.1 -> destination=:1.7 serial=19 reply_serial=2
root@x-uu:~#
$
$ lxc shell x-uu
root@x-uu:~# dpkg -l unattended-upgrades | cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-===================-==========================-============-===========================================
ii unattended-upgrades 1.1ubuntu1.18.04.7~16.04.2 all automatic installation of security upgrades

root@x-uu:~# cat /var/log/unattended-upgrades/unattended-upgrades.log
2019-04-11 11:31:44,714 INFO Initial blacklisted packages:
2019-04-11 11:31:44,715 INFO Initial whitelisted packages:
2019-04-11 11:31:44,715 INFO Starting unattended upgrades script
2019-04-11 11:31:44,715 INFO Allowed origins are: o=Ubuntu,a=xenial, o=Ubuntu,a=xenial-security, o=UbuntuESM,a=xenial, o=Ubuntu,a=xenial-updates
2019-04-11 11:31:52,034 INFO Initial blacklisted packages:
2019-04-11 11:31:52,034 INFO Initial whitelisted packages:
2019-04-11 11:31:52,035 INFO Starting unattended upgrades script
2019-04-11 11:31:52,035 INFO Allowed origins are: o=Ubuntu,a=xenial, o=Ubuntu,a=xenial-security, o=UbuntuESM,a=xenial, o=Ubuntu,a=xenial-updates
2019-04-11 11:31:59,193 INFO Packages that will be upgraded: snapd ubuntu-core-launcher
2019-04-11 11:31:59,194 INFO Writing dpkg log to /var/log/unattended-upgrades/unattended-upgrades-dpkg.log
2019-04-11 11:32:06,043 INFO All upgrades installed