egmde on Ununtu 16.04LTS

On Xenial the GTK and Qt Wayland backends expect to find the "unstable" Wayland extension xdg-shell V5, and Mir only supports the "stable" Wayland extension xdg-shell and the "unstable" Wayland extension xdg-shell V6.

There's a partial workaround as, in the 16.04 era, these toolkits also supported Mir as a backend, and egmde can be configured to exploit this.

The trick is to add the following line to ~/.config/egmde.config:

env-hacks=EGMDE_LAUNCH_PREFIX=env -u __EGL_VENDOR_LIBRARY_DIRS GDK_BACKEND=mir QT_QPA_PLATFORM=ubuntumirclient

Note, no longer works with GTK apps as the "gtk-mir" Mir support seems to have been dropped.