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?