[ubuntu] Disabled Administrator account

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http://ubuntuforums.org – Hi, firstly I know this is a silly thing to have done but equally, I am quite amazed that the system would allow me to "Disable" the only Administrator account. Secondly, although I have got as far as something called "Grub" and typed in "passwd" I have no real experience of it, and feel out of my depth in the Root thingy. The result so far is: "passwd:Athentication token manipulation error" and now I am really stuck. I am not even sure - if it came to it - how I could just reload the operating system and sacrifice all my stuff. I know the Admin pass (Hardware)