In my experience Ubuntu shows a little animation of up arrows, and maybe even says "swipe to start" if you look long enough at the login screen. It is pretty c

In my experience Ubuntu shows a little animation of up arrows, and maybe even says "swipe to start" if you look long enough at the login screen. It is pretty confusing the first time, and annoying every time after that, didn't conciously know about the "Enter" trick before now.