We had in a MariaDB Training Standard Linux distros with standard MariaDB Installations and wanted to upgrade to the newest MariaDB 10.1 from MariaDB repository.
We later found out because of an error in journalcontrol that an upgrade from the DD never happened:
we have the opinion that during upgrade MariaDB package should:
a) either upgrade with mysql_upgrade directly or
b) alternatively clearly should state that an upgrade is needed!