I think we are using the computers wrong. Thing is, Ubuntu is designed to be a mulit-user system in which each user has an account and logs into that account when they use the computer. You're not meant to have everyone using one login like we do. Ubuntu thinks that all of us are one person and behaves accordingly. We're working against the design of the system, which creates all kinds of problems, like the desktop being full of everyone's files, stuff getting lost. Ubuntu sensibly remembers your print preferences (A3, A4 etc.) which makes perfect sense if you're just one person, but the way we use it the next person comes along and presses Print and surprise someone's set it to A3 again.
We really need to setup accounts for each user, and have the same accounts shared across all four machines.
We could still have a passwordless guest account, and that could be reset to a pristine state on each login like with the computer in the red room.
I've had it with you. If I had an image of a laser gun I would absolutely position it right here in my hand...
Ha! I have a real laser absolutely positioned in my hand!