apt install nano
nano /etc/mysql/mysql.conf.d/mysqld.cnf
Strg+X / Y / Enter
mysql-ctl cli;
CREATE USER 'peter'@'%' IDENTIFIED BY 'abcd1234#';
GRANT ALL PRIVILEGES ON *.* TO 'peter'@'%';
SELECT user, authentication_string FROM mysql.user;
quit;
mysql-ctl restart
mysql-ctl start