root

[Andy]

Ubuntu Forums Post wrote:
> Ubuntu has chosen to use sudo instead of an open root account. Seems a poor choice, IMHO, but to apt-get, use:
> sudo apt-get update
> sudo apt-get install whatever...
> sudo is how you should run all root commands. You must be the user you first added during the installation. Use your own password when asked.
> 

There are good reasons for the choice - read the Wiki.

If you want a root shell (like SU) just type "sudo -s", or use "Root 
terminal" from the applications menu.

HTH

Andy