@dylan123 Reading a bit more about the apparmor stuff I found this: https://stackoverflow.com/a/49583958
I read in another SO thread comment that the apparmor=“DENIED” message probably isn’t the reason that MySQL (or in my case MariaDB) wasn’t starting, as it’s only a warning.
Confirmed by this bug report:
On the affected system, there was no noticeable impact (yet?) other than the denials, so I’d say it’s low impact.
Spinning up a VM with Ubuntu 18.04 I saw that quite true it has those log messages in /var/log/syslog on my VM as well but the DB is running perfectly fine. So just for the records: Those apparmor=“DENIED” message don’t cause an impact on the DB and can be ignored.
Check all the information George and Daniel posted as well as my suggestion on the mysql logs.