The uninstall has this section in prerm:
# Automatically added by dh_installinit/12.10ubuntu1
if [ -x "/etc/init.d/mysql" ]; then
invoke-rc.d mysql stop || exit 1
fi
# End automatically added section
This seems wrong, but if it is already stopped this still is fine and
has a return core ==0.
root@f:~# invoke-rc.d mysql stop
root@f:~# invoke-rc.d mysql stop
root@f:~# invoke-rc.d mysql stop
root@f:~# invoke-rc.d mysql stop
root@f:~# echo $?
0
Now I wonder in which state that is for you.
Even with the server disabled it should look like:
root@f:~# systemctl status mysql
● mysql.service - MySQL Community Server
Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset:
enabled)
...
The most likely reason (you had filed another bug with config files
removed) is that someone deleted /lib/systemd/system/mysql.service and
/etc/init.d/mysql.
$ rm /lib/systemd/system/mysql.service
$ rm /etc/init.d/mysql
$ systemctl daemon-reload
$ systemctl status mysql
$ systemctl status mysql
Unit mysql.service could not be found.
With that it would look like your report:
root@f:~# invoke-rc.d mysql stop
Failed to stop mysql.service: Unit mysql.service not loaded.
invoke-rc.d: initscript mysql, action "stop" failed.
But even then if you look above it would not run the code and uninstall.
All indicated some deep misconfiguration of your mysql service, I can't find
any more in the logs to help unfortunately :-/
Given the other bug that you have reported I'd recommend restoring the config
files of mysql to its default state (as shown in the other bug) - most likely
things will work then.
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https://bugs.launchpad.net/bugs/1884163
Title:
package mysql-server-8.0 8.0.20-0ubuntu0.20.04.1 failed to
install/upgrade: installed mysql-server-8.0 package pre-removal script
subprocess returned error exit status 1
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