How to login as root in ubuntu 6.06?

U need to set root passwd first in a terminal
and enter root passwd twice.
now run "gdmsetup" and in the tab security select/tick "Allow local system administrator login".now next time u can login as root.though its a security risk.i believe ur using standalone system.

see dapper wiki for more infi:
*easylinux.info/wiki/Ubuntu_dapper

@Executioner, Logging in as Root is a very bad practise!!
You can execute System Adminstration commands using sudo, gksudo, gksu.
If you login as Root , you compromise security!! That means any process can execute
as Root. That can do great damage to Ubuntu O.S.

Still if you need to access root shell use command
The method prakash told isn't recommended for newbies, it can get dangerous. Use a normal account and use sudo and gksudo when root access is needed.

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