18.04unattended-upgrades
The Docker daemon gets stopped and not restarted after unattended upgrades.
Is this normal?
Im using Ubuntu Ubuntu 18.04.5 LTS
Dec 01 06:39:19 systemd[1]: Starting Daily apt upgrade and clean activities...
Dec 01 06:39:26 systemd[1]: Stopping Docker Application Container Engine...
I occasionally have this issue and I'm not sure why docker has hung. But what I have found is that the timeout is explicitly set to unlimited in the service file deployed by docker-ce:
$ grep Timeout /lib/systemd/system/docker.service
TimeoutSec=0
To avoid this hanging for extended periods I set the TimeoutStopSec parameter in an override:
$ sudo systemctl edit docker.service
Add the following lines:
[Service]
TimeoutStopSec=300
Then reload:
$ sudo systemctl daemon-reload
Nothing is wrong with your systems, at least that is causing this.
Updates have resumed as of 1/4/21. If you do not receive any updates in the next day or so, please report back.
There haven't been any updates since then to the 18.04 repositories. I suspect they're taking the last two weeks of the year off. I got a google-chrome-unstable update on the 18th, but that is from a PPA.
The "stuff downloaded" is the index files that your systems use to determine if there have been updates or not.
Source: Ubuntu Updates
Best Answer
There is a bug in Ubuntu which caused this shutdown of dockerd. It occurred because of an automatic security update of containerd. See also https://serverfault.com/questions/1044493/how-to-make-sure-docker-service-will-start-after-containerd-upgrade.
The previously accepted answer disables the automatic security updates, so be aware of the consequences.