Jan 14 05:49:17 mc systemd[1]: Starting MariaDB 10.3.18 database server...
Jan 14 05:49:17 mc mysqld[5162]: 2020-01-14  5:49:17 0 [Note] /usr/sbin/mysqld (mysqld 10.3.18-MariaDB-0+deb10u1) starting as process 5162 ...
Jan 14 05:49:17 mc mysqld[5162]: 2020-01-14  5:49:17 0 [Warning] Can't create test file /var/lib/mysql/mc.lower-test
Jan 14 05:49:17 mc mysqld[5162]: #007/usr/sbin/mysqld: Can't change dir to '/var/lib/mysql/' (Errcode: 13 "Permission denied")
Jan 14 05:49:17 mc mysqld[5162]: 2020-01-14  5:49:17 0 [ERROR] Aborting
Jan 14 05:49:17 mc systemd[1]: mariadb.service: Main process exited, code=exited, status=1/FAILURE
Jan 14 05:49:17 mc systemd[1]: mariadb.service: Failed with result 'exit-code'.
Jan 14 05:49:17 mc systemd[1]: Failed to start MariaDB 10.3.18 database server.