The Free On-line Dictionary of Computing (30 December 2018):

buglix

   /buhg'liks/ Pejorative term referring to DEC's ULTRIX
   operating system in its earlier *severely* buggy versions.
   Still used to describe ULTRIX, but without nearly so much
   venom.  Compare AIDX, HP-SUX, Nominal Semidestructor,
   Telerat, sun-stools.