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So I am currently using 12.04 and have a GTX 580M, when I go to check the drivers it says that I dont have any proprietary drivers currently installed, so I am unable to download any newer ones (obviously.)

My problem is that I have been told that I will need to install the newest drivers in order for playonlinux etc. When I try and install the .run file direct from the Nvidia site it says that I need to close X Server first, however when I go into X Server it says

"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."

I have tried this in terminal and get this message

"Using X configuration file: "/etc/X11/xorg.conf".

VALIDATION ERROR: Data incomplete in file /etc/X11/xorg.conf.
                  Device section "Default Device" must have a Driver line.

Backed up file '/etc/X11/xorg.conf' as
Backed up file '/etc/X11/xorg.conf' as '/etc/X11/xorg.conf.backup'
New X configuration file written to '/etc/X11/xorg.conf'

Does anyone know how I can go about getting this to work?

EDIT: I have tried stopping X Server through terminal and all this does is close the GUI, it still wont allow me to apply the drivers

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As mentioned here in this blog post,

After executing sudo nvidia-xconfig, you need to enable additional drivers.

Execute sudo software-properties-gtk which will open up a window like this

enter image description here

Select the latest driver and then reboot your machine.

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