You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server.

Refer from :: http://ubuntuforums.org/showthread.php?t=592837

Solved :::

1) Download the latest Nvidia driver for Linux.

2) Install the driver according to the instructions given on the Nvidia web site. You will also have to stop the X-server when installing the driver, a good way would be to install the driver in Recovery Mode.

3) After installation, configure the x-server using:-

Code:

sudo dpkg-reconfigure xserver-xorg

Code:

sudo dpkg-reconfigure -phigh xserver-xorg

, then restart my computer, X starts up perfectly and uses the nv driver. Now if all I do is modify the file /etc/X11/xorg.conf so that the line

Code:

Driver    "nv"

reads

Code:

Driver    "nvidia"

Ok I found some more information that should be useful. There are 3 versions of the nvidia driver on Ubuntu. Each version is in a different package:

• nvidia-glx-legacy contains version 1.0.7185
• nvidia-glx contains version 1.0.9639
• nvidia-glx-new contains version 100.14.19

Each version supports a different set of nVIDIA graphics cards. Go to http://www.nvidia.com/object/IO_32667.html to determine which version supports your graphics card. If you don't know what graphics card you have, go to System > Preferences > Hardware Information, or run the command lspci on the command line.

I have an nVIDIA GeForce FX 5200, which needs nvidia-glx-new, but I had nvidia-glx installed. I'm going to try installing nvidia-glx-new and see whether that gets me any further.