Just to verify, I installed docker.io version 19.03.8-0ubuntu1.20.04.1,
started up dockerd, verified /var/lib/docker got some content in it, and
then stopped dockerd and ran "apt purge docker.io", and
"/var/lib/docker" was properly emptied. It was not removed completely
(in case it's a mount point
This confuses me, because this is already implemented?
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https://git.launchpad.net/ubuntu/+source/docker.io/tree/debian/docker.io.prerm?h=applied/ubuntu/devel
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https://git.launchpad.net/ubuntu/+source/docker.io/tree/debian/docker.io.postrm?h=applied/ubuntu/devel
It was added ~four years ago in
