[ubuntu] Cannot Login anymore

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http://ubuntuforums.org – Hi, I have wubi installed. It was working sluggish so I rebooted. Now, in the login screen I get a message:Install problem The configuration defaults for GNOME Power Manager have not been installed correctly. Please contact your computer administrator And it is impossible to login. I can always login in console mode as root (recovery). What should I do to re-establish the login? Thanks, S. (Hardware)