Mysql reinstallation

$ /etc/init.d/mysql start
[…] Starting mysql (via systemctl): mysql.serviceJob for mariadb.service failed because the control process exited with error code. See “systemctl status mariadb.service” and “journalctl -xe” for details.
failed!

What is the output of above command?

Also check MySQL error log for traceback before reinstalling.
Location
/var/lib/mysql/mysql-error.log

$ /etc/init.d/mysql start