@slash_89:be cool man.most ppl posts their queries in a guessable and easy manner.that's why.mehulved is techurfuture is a long time moderator here in open source section.he is pointing u the right way,see:
How To Ask Questions The Smart Way
as with ur original question.at any time u can go into Command line(CLI) by pressing CTRL+ALT+F1 to F6 there are 6 virtual terminals as set by upstart and in other distros it is (even in Ubuntu if present) /etc/inittab file which controls the no of pseudo terminals available.
Inorder to boot directly into CLI open the terminal from Applications>Accessories>terminal in ubuntu,now:
Code:
~$ sudo update-rc.d -f gdm remove
give ur password(will not be visible) and press enter.next time no gdm to login and ur directly there at terminal.

regarding the error.do u ran the driver from shell as root or sudo(that with "#" prompt)...X error may be some dependencies are missing.
also these nvidia drivers are mostly available ready in distributions like Ubuntu etc(check restricted packages manager or just read
http://ubuntuguide.org )
Just post what error u got that can pinpoint..(copy paste from terminal)