Step 8: Install MySQL
Again, either start an SSH session, or continue if you're already in one.
Type in "sudo apt-get install mysql-server mysql-client php5-mysql" and hit Return / Enter.
You will be asked "Do you want to continue?", press the "y" key, then Return / Enter.
This will take a while to download and install, but a screen will appear asking you to set "New password for the MySQL "root" user", enter a password, then confirm it.
Again, wait a while, then you're done.