severity 809669 critical tags 809669 + patch -- Hi,
I bumped the severity of this bug because I have seen it cause at least three systems to hang (possibly until the Unattended Upgrades Shutdown job times out - I've never waited that long) on every single shutdown/reboot. This makes some systems which reboot often almost unusable. The hang is apparently because /var is unmounted before unattended-upgrade-shutdown runs, which causes it to falsely believe that there's an unattended-upgrade running. In any case, it causes restart/shutdown to hang every time with the only way to get anything to happen in a timely manner to cut the power or Alt-SysRq-b. The problem is caused by an incorrect unattended-upgrades.service file. According to upstream[0] rather than targeting shutodwn.target, the correct way to order jobs on shutdown is to use an empty ExecStart with the desired command in ExecStop. I've tested the following /etc/systemd/system/unattended-upgrades.service file and it fixes the problem for me: [Unit] Description=Unattended Upgrades Shutdown After=network.target Documentation=man:unattended-upgrade(8) [Service] Type=oneshot RemainAfterExit=yes ExecStop=/usr/share/unattended-upgrades/unattended-upgrade-shutdown TimeoutStopSec=900 [Install] WantedBy=multi-user.target [0] https://lists.freedesktop.org/archives/systemd-devel/2014-October/023860.html -- Regards, Scott.
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