How can I tell what drivers I have installed? like nvidia 185 or 190.
i get Error: unable to open display
If you don't have the drivers running you could look at the file names i guess:
ls /usr/lib/libGL.so.*
So, I'm assuming that you're trying to find this info out via SSH? Hence the 'Error: unable to open display' response.
You can try this first:
export DISPLAY=:0.0
Then:
glxinfo | grep OpenGL
That should give you the doodads you're after!