Upgrading of Backtrack Failed

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http://www.backtrack-linux.org – When I was using backtrack, a screen popped up saying that there is an upgrade to kubuntu (inside backtrack) 12.10. I accepted it. Subsequently, the OS became Kubuntu 12.10 generic pae instead of Ubuntu 8. something as it originally was. Now even ever I startup, it will lead me to a GUI screen and ask me to log in. The login screen is here: http://apcmag.com/images/kde-loggingon_625.jpg PROBLEM: 1) I have no user account in backtrack so I cannot log in. 2) The GUI will prompt me that I cannot log in as root. (HowTos)