user brain damage

from The Free On-line Dictionary of Computing (8 July 2008)

User Brain Damage
UBD

   <humour> (UBD) A description (usually abbreviated) used to
   close a trouble report obviously due to utter cluelessness on
   the user's part.  Compare {pilot error}; opposite: {PBD}; see
   also {brain-damaged}, {PEBCAK}.

   (1998-08-27)