Ubuntu 16.04 with Gnome Flashback Compiz can be made to look almost indistinguishable from Ubuntu Gnome 10.04, desktop cube included. Very few tweaks are needed. The only missing parts are the File, Edit menus on some applications, most notably Nautilus (they're working on it) but I don't really use the Gnome applications, except Nautilus and the menus are not that useful (I setup my preferences in Unity and it remembers them). The Gnome default apps look like the vanilla featureless versions of what one actually needs. Only the general DE is good.