Installing the kwin stuff stopped the immediate crashes. Could not see any text except some highlighted stuff and pieces of menus. Go to system settings, somehow, and set the compositor to xrender. This got everything painted again.
Now of course, had to start over. Some pieces, widgets, are missing, even thought they were explicitly installed. Icon themes have missing pieces, and size-related flaws. But ... Plasma 5 is up and running and (mostly) quite nicely! -- To UNSUBSCRIBE, email to debian-kde-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/2005777.5c0yEHm2FE@dovidhalevi