Thanks for this bug report. The problem can be reproduced by running the
following in a fresh Focal LXD container:
apt update
apt install mariadb-server
apt remove mariadb-server
apt install mysql-server
At this point mysql is in a very broken state. Its systemd units looks
masked:
# systemctl status mysql
Unit mysql.service could not be found.
and this is why trying to remove it with:
apt remove mysql-server-8.0
fails, as the uninstall process tried to `systemctl stop` the service.
This is the error this bug report is about, but it's worse. If at this
point we purge mariadb:
apt purge mariadb-server-10.3
it will also delete the mysql user, which at this point should be
"owned" by mysql - and possibly other things.
It seems that a Conflicts relationship between the two packages is not
strong enough. Maybe Breaks could avoid this?
** Changed in: mysql-8.0 (Ubuntu)
Status: New => Triaged
** Tags added: server-next
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https://bugs.launchpad.net/bugs/1889328
Title:
package mysql-server-8.0 8.0.21-0ubuntu0.20.04.3 failed to
install/upgrade: installed mysql-server-8.0 package pre-removal script
subprocess returned error exit status 1
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