To create a mysql db on ubuntu, ssh into your server and enter mysql by typing:
mysql -u root -p
Enter your password.
You should be in the mysql prompt now.
Create the db by:
CREATE DATABASE db_name;
Create the user for the db:
CREATE USER 'db_user'@'localhost' IDENTIFIED BY 'newpassword'; FLUSH PRIVILEGES;
Grant the user privileges by:
GRANT ALL PRIVILEGES ON `db_name` . * TO 'db_user'@'localhost'; FLUSH PRIVILEGES;