Hi! Thanks for reporting this. What does the exact process listing look like on a system that has the Akonadi server running?
What do these commands below yield on your system? pgrep -x --nslist pid --ns $$ "mysqld|mariadbd" pgrep -af "mysql|mariadb" Indeed, the preinst has a section where it tries to stop any existing servers. This section has been there for years and years, this is nothing new in 10.11. Maybe it should have an extra check for Akonadi in particular, or maybe some trigger for Akonadi to restart the embedded MariaDB it has.
