Could you please try both:
(a) An older version of the nvidia driver that is supported in Ubuntu 12.04: https://launchpad.net/ubuntu/+source/nvidia-graphics-drivers https://launchpad.net/ubuntu/+source/nvidia-graphics-drivers-updates
(b) Removing NVIDIA drivers completely (assuming the default fallback "nouveau" driver works for you)
Could you please try both:
(a) An older version of the nvidia driver that is supported in Ubuntu 12.04: /launchpad. net/ubuntu/ +source/ nvidia- graphics- drivers /launchpad. net/ubuntu/ +source/ nvidia- graphics- drivers- updates
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(b) Removing NVIDIA drivers completely (assuming the default fallback "nouveau" driver works for you)