This trick works well if you have forgotten your superuser password, type linux single at a LILO/Grub prompt. Then passwd once the system has started and you are at a console.
Grub:
If you are using grub go to the relevant line (the one with the kernel and various options) then press 'e' for edit and add "single" on to the end of the lines that boot the kernel. Then hit [Enter] and press 'b' (to boot).
Lilo:
If you are using lilo press escape and type " linux single" and then hit [Enter] to boot.
Security Warning
This is also a basic security hazard if you have others using your computer and security is a concern, you may like to add a password to your LILO or Grub prompt to stop this from being done.
thanks to learnubuntu.blogspot.com
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