If you have an nvidia graphics card on your computer, the default Nvidia drivers installed when you install Ubuntu 12.04 on your desktop with the Nvidia graphics hardware, give a problem starting the GUI. Several AMD motherboards come with on-board NVidia graphics.
To overcome this problem, you need to install the 3 packages listed below:
nvidia-173_173.14.35-0ubuntu0.2_i386.deb
nvidia-settings_295.33-0ubuntu1_i386.deb
screen-resolution-extra_0.14ubuntu2_all.deb
Install them on your computer using the commands below:
$ sudo apt-get install nvidia-173 nvidia-settings screen-resolution-extra <enter>
Now restart your computer.
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