MySQL/MariaDB

$ sudo apt install mariadb-server libmariadb-dev
$ sudo mysql_secure_installation

Verify your installation

$ mysql --user=root
ERROR 1698 (28000): Access denied for user 'root'@'localhost'
$ sudo !!
MariaDB [(none)]> show databases;
MariaDB [(none)]> \q

Make your user a superuser within MySQL/MariaDB

$ echo $USER  # make a note of your username
$ mysql -uroot
MariaDB [(none)]> CREATE USER 'your-username'@'localhost' IDENTIFIED BY 'your-password';
MariaDB [(none)]> GRANT ALL PRIVILEGES ON *.* TO 'your-username'@'localhost' WITH GRANT OPTION;
MariaDB [(none)]> FLUSH PRIVILEGES;
MariaDB [(none)]> \q

[source]