:: Ahmad Bekdash Blog ::

The problem was with a previous installation of Nvidia drivers that was removed.
Although I am using the intel driver, the GLX extension from Nvidia was being picked up. This is because the alternatives tool is still linked to nvidia for glx lib.
Fixed it with following commands -

sudo apt-get purge nvidia*
sudo apt-get install –reinstall xserver-xorg-video-intel libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core
sudo dpkg-reconfigure xserver-xorg
sudo update-alternatives –remove gl_conf /usr/lib/nvidia-current/ld.so.conf

restart

that is all