I will assumed you have nvidia restricted driver already running without issue, and just want to enable dual screen. Nvidia has it's own configuration tool called nvidia-settings. You should use that, instead of the Ubuntu's "Screen Resolution" utility.
Install it via Synaptic Package Manager, or run the command below:
Code:
sudo apt-get install nvidia-settings
Before you begin, back-up /etc/X11/xorg.conf file, in case you messed up and need to revert.
Run nvidia-settings with root privilege:
Code:
gksudo nvidia-settings
You have to decide whether to use twinview or separate X screens. Save the changes you made to xorg.conf, by clicking "Save to x Configuration File".
Once done, you need to restart Xorg, or simply reboot for the changes to take effect.
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