[ubuntu] How do I disable 'X Server' so I can install Nvidia drivers?

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http://ubuntuforums.org – I am trying to install Nvidia graphics display drivers but it says I must disable X Server first. I have read that I need to press CRTL+ALT+F(1-6) to get into a TYY terminal. I am not able to login when it asks me to. It says "[hostname] login:" then I can my user name here... and then it says "password:" No matter what username/hostname/account name I use (I think I gave 2 very similar names during install) the password is not correct. Is there some username password that I am supposed to setup for this? The username/password I use to log into the Desktop when I turn (Hardware)