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I am trying to find a better driver for my graphics card and I tried using the 313 driver for Nvidia in the X.Org Stable ppa. After the process, i cannot boot into my ubuntu 12.04 partiton. i can boot with a live cd and access the partition and everything is there. How do I go back to the default drivers?

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up vote 1 down vote accepted

You must boot the corrupted Ubuntu system and login to a VT (CTRL+ALT+F2 ... F5) . Then remove the PPA you have added. Before that you should remove the nvidia driver first.

sudo apt-get purge nvidia-*
sudo rm /etc/X11/xorg.conf

Now install ppa-purge and remove the ppa

sudo apt-get install ppa-purge
sudo ppa-purge ppa:<name of ppa here> 
sudo apt-get update

I don't know this X.Org Stable ppa you said. If you meant X-Ubuntu Team then the above command should be

sudo ppa-purge ppa:ubuntu-x-swat/x-updates

Reboot your system.

sudo reboot 

I suggest from now on to use only the Official Ubuntu packages (drivers especially)

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I got everthing working again and now the nvidia x server settings won't start in the dash when it is clicked on. – Michael Scott Jul 1 '13 at 22:28
How you got everything working again ? Did you follow my answer ? If yes, then you should not have nvidia settings at all. – NikTh Jul 2 '13 at 10:16
Yes everything is working now. – Michael Scott Jul 2 '13 at 19:04

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