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I just installed Ubuntu 12.04 LTS from a USB stick. After the Installation (XP works besides) grub shows both OS. When trying to start there is the purple Screen for some seconds, and then the Screen goes black, but with backlight. No mouse no cursor.

With Ctrl+Alt+F2 I get into tty1. Trying startx I get to the Messages that state:

failed to load module "nv" and some other NVIDIA related error messages.

Well, from the stick without Installation on HDD everything was great, but now I dont get into the GUI.

Maybe there is some help for me? I tried updating of the Drivers and some other things, (ppa) but it does not work

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Can you load the text only version? I.E., Server? – user1333634 May 15 '12 at 23:28

nv is deprecated open source driver. Make sure you don't have it in xorg.conf, and try blacklisting it with:

echo "blacklist nv" | sudo tee -a "/etc/modprobe.d/blacklist.conf"

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