$ sudo apt install mysql-server
# Secure the installation (Login doesn't work without this)
$ sudo mysql_secure_installation

# For temporary remote access, you can unbind MySql Server from 127.0.0.1 by editing the config file
$ sudo vim /etc/mysql/mysql.conf.d/mysqld.cnf
# Comment out the line
bind-address            = 127.0.0.1
# By adding # at the beginning
$ sudo systemctl restart mysql

# Add remote root user. Remove 'WITH mysql_native_password' to use new password encryption
$ sudo mysql
CREATE USER 'newuser'@'%' IDENTIFIED WITH mysql_native_password BY 'password'; 
GRANT ALL PRIVILEGES ON * . * TO 'newuser'@'%' WITH GRANT OPTION;
FLUSH PRIVILEGES;
quit;

# Allow MySql through firewall
sudo ufw allow from any to any port 3306
# This is dangerous, as you basicly gave a root user access from anywhere. Disable this after you finish, and bind the server to locahhost