I know the detailed answer of this question.
But I tried compiz composite manager
and it didn't work. I had no possibility to get ardesia
running with installing with the source because there's no package in 18.04. With pylote
(it works!) I only can draw on screenshots and not on changing screens.
The best possibility is gromit-mpx
but I need straight lines, circles, rectangles and text, too.
Is there a newer possibility for drawing free hand, lines, circles, rectangles and text on changing backgrounds?