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I am using ubuntu for business. I don't know what happened, but now my computer does not open. There is a message on the down right side of the computer that reads:

Install problem The configuration defaults for GNOME Power Manager have not been installed correctly. Please contact your computer administrator. 
  • How to re-install GNOME Power Manager
  • How can I delete a directory, using command prompt, especially for some corrupted folders and files?
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