[ubuntu-uk] Forgotten password for log in....

[scoundrel50a]

I cant remember my log in password for one my computers and tried all 
sorts of different passwords, but to no avail. I even tried following this

http://www.psychocats.net/ubuntu/resetpassword

but get to selecting root, and that is where things are different, on 
the page it allows you to enter this 'mount -0 rw, remount /' but mne 
doesnt it asks for a root password, and I cant go any further....is 
there a command via the terminal to change the password?

Thanks



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