graphics - Cannot properly boot into Ubuntu after installation of Nvidia driver

I'm on Ubuntu 12.04.

Everything was fine until I did a fresh install of a proprietary driver for NVIDIA, using the "Additional drivers" utility. After having restarted my computer, I cannot access to my session as usual anymore.

Different things can happen:

• It starts under Ubuntu GNU GRUB with Linux 3.2.0-26-generic-pae, and it looks like a terminal, I can log in and all. startx gives me weird colored patterns on the screen and keeps frozen.


• It freezes immediately with the weird patterns, or with just a purple screen and my cursor after showing the "Ubuntu" login purple screen.


• Or it shows the usual login screen, but completely deformed, and unusable.

I tried sudo dpkg-reconfigure nvidia-current to fix my problem, but it didn't work.

Could you help me please ?

Try removing your freshly installed Nvidia driver and go back to the open-source driver, Nouveau.
Log in to the command line interface of Ubuntu, launch sudo apt-get install nouveau-firmware (just in case) then follow the instructions at https://askubuntu.com/a/12941/5592:

To reconfigure xorg.conf, type the following command:

sudo dpkg-reconfigure xserver-xorg

Go following the screen steps, answering the wizard questions and you

should able to restore or reconfigure to previous Nouveau state.

After that, if this solved your problem, you will probably have a very low resolution. So launch the "Displays" utility from the Dash home and adjust your resolution accordingly to fit your screen the best.