Quote Originally Posted by Bob Pendleton
Run glxinfo and look at the visuals listed at the bottom of all that
data it dumps out. Check to see if you have a visual that supports a 8
bit stencil buffer along with all the other buffers you are asking for.
You might find that your card does not have a mode that supports a 8
bit stencil buffer.

To fix the problem you either have to use a mode your video card
supports or buy a video card that supports the mode you need.