Started afresh - post 8
Whatever happenned, it is nice it happenned, which allowed me to uninstall Nautilus. Anyway, Nemo is there now without any other “default” file manager around. Simply installed Nemo from Tessa repo to get 4.0.6.
Desktop is working, for everything is working. It is Ubuntu without Ubuntu dock and the other extension. I manually deleted them – not uninstalled – and blocked them from getting reinstalled. And, without Nautilus. My installation now is an interesting subject to keep an eye on, to see what happens with the upgrades. I don’t expect much change in the Ubuntu base, though.