Q. How do I disable sudo command? I prefer old way to become super-user i.e use of 'su -' command.
A. New Ubuntu Linux v6.06 (LTS) Server is here and one of the annoying feature is use sudo (which is good for Desktop systems) for each command. On a dedicated Linux server I prefer to use su to become a super user and then run command and log out.
So after installation type following commands to setup root account:
sudo passwd root
Input root password.
Now use su for rest of your work:
$ su -
Then carry out all your work.
Please note that I personally recommend using sudo, which is much more secure and better to use. But, since you asked for it I had give you all the instructions.