Other Help Topics :: Root password

What is the root password?

In a term window type:
sudo su
That will get you to root, then type:
passwd
That will set your root password.

Is there a way of disabling the 'sudo su' command once you have set the root password, otherwise anyone could come along and access you machine?

Sure, you can remove sudo.
'apt-get remove sudo' should be okay, but you will lose some functionality in the menu. I believe you can replace the sudo command with 'su-to-root' in the menu and get some of the same functionality, but you will have to type the root password each time.

original here.