I recently downloaded Ubuntu and now I am trying to start to use the new OS. However to do pretty much anything I want to do I need to "authenticate" things. I am the administrator and I have put into place my password to log into the computer. I assumed that this is the password to be used to authenticate things. As I have looked around the web this is what seems to be true. However it will not accept that as the correct password and does not allow me to do what I want after three tries. It keeps saying that "your authentication attempt was unsuccessful. please try again." Is there a different password that I am supposed to use. If not is there a way to change that password or at least figure out what that password is.