I only tested the Gnome Global AppMenu extension on X.Org (which is default in Ubuntu 18.04) though. The extension developer announced it discontinued the project a while back, but he changed his mind back in January 2018, when he successfully added support for Wayland. The extension also provides support for HUD menus so you can search in an application's menus. Gnome Global AppMenu is a Gnome Shell extension that's currently in beta, which implements Ubuntu Unity's global menu to Gnome Shell.
