Originally Posted by wa1ter
Xlib: extension "GLX" missing on display ":0.0".
Error: couldn't get an RGB, Double-buffered visual
No, sorry, this error message is typical, while loading the X11 glx extension.
Check your Xorg.?.log.
What was your fix, and can you run glxgears?
You have to install the whole NVIDIA package with up to date GLX libraries.
I did it by executing the nvidia-installer in -e (expert mode). It was quite simple.
I tried glxgears and eve-online. Both worked fine.