(Solved) Upgrade from MySQL to MariaDB breaks Akonadi

[Volker Wysk]

Hello!

When you upgrade MySQL to MariaDB, Akonadi won't start any longer. This 
happens on Kubuntu, but it could also happen somewhere else.

The package mariadb-server needs to be installed for MariaDB (again, on 
(K)Ubuntu).

This replaces MySQL (mysql-server-core-5.7 and mysql-client-core-5.7). After 
that, Akonadi won't start any longer. "aconadictl start" outputs a lot of 
messages.

The problem can be repaired by doing this, after the installation of MariaDB:

akonadictl stop
rm -r ~/.local/share/akonadi
akonadictl start

Bye,
Volker