Can you please also check that you have indicator-appmenu installed? (It is not the same as indicator-applet-appmenu).
Also, please paste output of this command somewhere:
gdbus introspect -e -d com.canonical.AppMenu.Registrar -o /com/canonical/AppMenu/Registrar
Can you please also check that you have indicator-appmenu installed? (It is not the same as indicator- applet- appmenu) .
Also, please paste output of this command somewhere:
gdbus introspect -e -d com.canonical. AppMenu. Registrar -o /com/canonical/ AppMenu/ Registrar