Had great success on Kubuntu. Set up the desktop to have two giant icons only: Firefox, and shutdown.

On Windows the constant popups for updating various components were causing much confusion Java, flash (back in the day), printer "drivers", and of course windows itself would throw popups about updates requiring clicking buttons every time they used the computer, which was very infrequently, and cause them much confusion ("what does update mean" ?")

Meanwhile on Kubuntu all updates go "shhhh" in the background, and no more confusing "To shutdown, press Start"