No Accounts to Log in With?

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http://askubuntu.com – I have installed Ubuntu 12.04 LTS and the only accounts I have to select from to log in are "Administrator" and "Guest". "Guest" has no real rights to anything and I have no password for "Administrator". If I enter the recovery mode and the root console it does not "find" the "passwd" command if I try to reset the root (Administrator?) password. It also does not "find" the sudo command. I have no way at all of logging in with the Administrator account and the Guest account is useless. Right now, my installation of Ubuntu is about as useful as a brick. If the "Administrator" account (is t (HowTos)