Comment 3 for bug 1806263

Hi,
thank you for your report and your help making Ubuntu better!
This is not a bug but a problem with apparmor profile shipped with mysql still enabled.

You will find here various solutions to this:
https://mariadb.com/kb/en/library/the-community-mariadb-troubles-only-running-after-reboot-times-out-when-try/

Regards,
Faustin