Comment 15 for bug 1741579

Tested with 1.1ubuntu1.18.04.7~16.04.1:

root@x-uu-ref:~# 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 1.1ubuntu1.18.04.7~16.04.1 all automatic installation of security upgrades
root@x-uu-ref:~# grep -B1 please /usr/share/unattended-upgrades/unattended-upgrade-shutdown
    msg = _("Unattended-upgrade in progress during shutdown, "
            "please don't turn off the computer")
--
            _("To enable monitoring the PrepareForShutdown() signal "
              "instead of polling please install the python3-gi package"))
root@x-uu-ref:~#