I am a total newbie to Linux. I installed Ubuntu 14.04 last night and am trying to install PI. I have it extracted and enter the command into a terminal window (following the instructions on the PI site). It then asks for a password. No matter what I enter, I always get a message that authentication failed. I have used my login password for Ubuntu, my PI access password and nothing works, not even just hitting enter. It gives the error and stops. What am I supposed to enter there?
Chris