smacnay:/home/smacnay# dpkg --purge nvidia-glx-dev
dpkg: dependency problems prevent removal of nvidia-glx-dev:
 libglu1-mesa-dev depends on libgl1-mesa-dev | libgl-dev; however:
   Package libgl1-mesa-dev is not installed.
     Package libgl-dev is not installed.
       Package nvidia-glx-dev which provides libgl-dev is to be removed.
       dpkg: error processing nvidia-glx-dev (--purge):
        dependency problems - not removing
	Errors were encountered while processing:
	 nvidia-glx-dev