akonadi fails with mariadb upgrade

[Pip]

Fixable with

sudo aa-complain /usr/bin/akonadiserver

or by downgrading mariadb.
More details at 
https://www.reddit.com/r/linux4noobs/comments/ic543p/updated_mariadb_and_now_akonadi_wont_start/
https://www.mail-archive.com/kde-bugs-dist@kde.org/msg474189.html
https://www.reddit.com/r/kde/comments/icz14s/akonadi_wont_start_after_mariadb_update/