Installed driver for graphics card, now it boots directly to terminal

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http://www.linuxquestions.org – Finished installing Ubuntu 10.10 in my XPS15, intel i5 4g ram, nvidia GT 420M graphics card, problem is when i go to additional drivers, the driver listed (Nvidia accelerated graphics) when I install it and reboot it the computer starts on the terminal, no graphic interface. All I get is the black screen asking me login and password, when I enter them, just get the terminal prompt in a black screen. Any solutions are appreciated. Thank you. (HowTos)