I just installed Ubuntu 13.10 on a new machine, admiring the clean spartan interface not cluttered with anything like an Applications or systems menu. Apart from the dock-like thing to the left, it's absolutely zen-empty. This is the exact kind of interface I've long felt that Linux should adopt on the desktop if it was going to win the hearts and minds of people who never do any work.
But I have stuff to do.
I see how to launch apps, in particular a terminal window.
How do I logout? And, which I do far more frequently, how do I lock the screen?