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I am trying to upgrade Ubuntu 18.04 with a standard apt update && apt upgrade but I am getting a failure. What should I do to proceed and keep the system updated?

I'm getting the error:

Setting up docker.io (20.10.2-0ubuntu1~18.04.2) ...
mv: cannot stat '/var/lib/docker.migrating/*': No such file or directory
dpkg: error processing package docker.io (--configure):
 installed docker.io package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 docker.io
E: Sub-process /usr/bin/dpkg returned an error code (1)
2

The issue has been reported and a workout was suggested here: https://github.com/ubuntu/zsys/issues/170#issuecomment-826359558

Following the steps worked for me.

sudo mkdir /var/lib/docker.migrating
echo 'dummy' | sudo tee /var/lib/docker.migrating/workaround.txt

this will allow the stat '/var/lib/docker.migrating/*' to not fail with an error.

After the successful apt update docker.io run, you can remove the workaround dummy file:

sudo rm /var/lib/docker/workaround.txt

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