Comment 16 for bug 1797643

For now I've added in this more permissive change to apparmour permissions from kubuntu which seems to stop the first-run error
https://launchpadlibrarian.net/393075010/akonadi_4%3A18.04.3-0ubuntu1_4%3A18.04.3-0ubuntu2.diff.gz
Switching to a symlink as suggested by Sandro may make more sense.
I'm unclear what this stuff about mariadb is about.