mark@mark:~$ Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Error: couldn't find RGB GLX visual
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
XGL Absent, checking for NVIDIA
Nvidia Absent, assuming AIGLX
Xlib: extension "GLX" missing on display ":0.0".
beryl: Root visual is not a GL visual
beryl: Failed to manage screen: 0
beryl: No manageable screens found on display :0.0
Window manager warning: Lost connection to the display ':0.0';
most likely the X server was shut down or you killed/destroyed
the window manager.
XGL Absent, checking for NVIDIA
Nvidia Absent, assuming AIGLX
Xlib: extension "GLX" missing on display ":0.0".
beryl: Root visual is not a GL visual
beryl: Failed to manage screen: 0
beryl: No manageable screens found on display :0.0