I have STACK IN ubuntu 12.04.1 console login screen, how exit(shut down)

[lse123]

I have STACK IN ubuntu 12.04.1 console login screen, how exit(shut down) or how return to graphical user interface?

now shows: // using it in my mac using parallels vm // no mouse cursor
============================
"Login:..."
============================
how to close the window...?

[lse123]

I shut down my mac but AFTER RESTART,...every time I go to Linux appear console "Ubuntu Login:..."
How go to GUI ... AND STAY TO THIS MODE PERMANENTLY EVERY LINUX MACHINE STARTUP?