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  1.                 From Jargon File (4.3.1, 29 Jun 2001):
                

    
                
                  
    UBD /U-B-D/ n. [abbreviation for `User Brain Damage'] An abbreviation
   used to close out trouble reports obviously due to utter cluelessness on
   the user's part. Compare pilot error, PEBKAC; oppose PBD; see also
   brain-damaged.

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