Following are the steps to install Ubuntu Nvidia drivers and activating it.
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1sudo apt-get install linux-headers-$(uname -r)
2sudo apt-get install nvidia-310
3sudo apt-get install nvidia-313-updates
4sudo apt-get install nvidia-settings

Once the instllation of the above mentioned packages are successful, run\\

1sudo nvidia-xconfig

This will create the /etc/X11/xorg.conf file
\\ Now, do\\

1sudo software-properties-gtk

\\ Which will open up a window like this
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[[http://i.stack.imgur.com/KvijW.png]​​]

\\ Select the latest driver name from the list and then do
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1sudo reboot

\\ That's it :)
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