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So I have been using linux mint for a while now. A few months ago my Gnome shell crashed and I was unable to use the full 3d features and loaded into fallback mode only. From that day (around 2 months ago) I still have only fallback mode (both Gnome and cinnamon). I installed Linux mint maya, and Ubuntu 12.04 both as windows file and complete installation in an external hard drive. and for many times I sitll cannot fix this problem. ps I made sure to download all the drivers for my graphics card. what could the problem be?

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What happens when you execute gnome-shell --replace in an xterm? Does it print any useful message? – eppesuig Jan 18 at 14:05
Xlib: extension "GLX" missing on display ":0.0". Segmentation fault (core dumped) – Melkar Muallem Jan 19 at 7:35
You found the problem: check your X driver and verify if GLX is supported. What video card do you have? And what driver are you using in /etc/X11/xorg.conf? – eppesuig Jan 19 at 8:35

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