Did you get it working?
I had the same issue testing out mariadb and loading the libraries, I was furious that it overwrote my tables, libraries, data, etc.. (I thought it would install parallel and read my db so that I could test performance over true mysql server).
I just completely uninstalled any trace of it. If you need to backup data, do a mysqldump first.
https://askubuntu.com/questions/806107/remove-mariadb-mysql-databases