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Possible Duplicate:
System won't boot with nvidia driver enabled

I am new to Ubuntu. I installed Ubuntu 11.10, and downloaded the nVidia GEForce 8400 GS Graphics card driver from the official site. It was a .run file, and then I entered the TTY3 interface (Alt+Ctrl+F3) and installed the graphics card as a superuser. After that, the normal GUI of Ubuntu is not coming. I did few restarts, but some lines which says "Starting Bluetooth [OK] and Checking Battery status... [OK]" something like that are displayed, then nothing happens. Please tell me what to do. Thanks

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marked as duplicate by fossfreedom May 6 '12 at 10:42

This question was marked as an exact duplicate of an existing question.

What is the output of alt ctrl f7 – Tachyons Apr 9 '12 at 0:49

Your driver is conflicting with things and stopping you from being able to boot up. What you probably want to do is boot up with the nomodeset option so that you only use the most basic programs, install the normal proprietary driver as recommended by the system if you can boot, and then you will be good to go. I also couldn't boot with a nvidia card until I got the driver straight.

This thread looks potentially useful for you.

Ubuntu 11.10 won't boot with nvidia driver enabled

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