https://discourse.osmc.tv/t/wiki-install-and-configure-mysql-server-and-clients/19170/17 https://www.itzgeek.com/how-tos/linux/debian/how-to-install-mariadb-on-debian-9.html https://www.linuxbabe.com/debian/install-lamp-stack-debian-9-stretch
sudo apt install mariadb-server mariadb-client
Now run the post installation security script.