Help, I changed my user password and made a typo [closed]

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http://askubuntu.com – Possible Duplicate: How do I reset a lost Administrative(root) password? I am still logged in but can't do anything sudo. I changed the password but I think there must have been a typo or something. So if I log out I wont be able to log in. Is there any remedy or solution to this. I just want to remove all password privileges or change to my earlier password. (I am the only user on this personal machine.) (HowTos)