Good day. I have such an error on starting of glxgears: Xlib: extension "GLX" missing on display ":0.0". Error: couldn't get an RGB, Double-buffered visual How can I fix it? Thank You for Your time.
Are you, by chance, using the proprietary nvidia driver? If so, you will probably need to reinstall it. Stuff like that happens to me if I update the kernel, and forget to reinstall the nvidia driver afterwards. Hope this helps! -- Kevin