install mysql in ubuntu and remove mariadb ubunutu code example
Example 1: uninstall mariadb server and client in ubuntu 18.4
sudo systemctl stop mysql
sudo apt-get remove --purge mysql-server mysql-client mysql-common
Example 2: uninstall mariadb server and client in ubuntu 18.4
sudo apt-get autoclean
sudo rm -rf /var/lib/mysql/
sudo rm -rf /etc/mysql/