In Ubuntu Mate 18.04.5 there exist keyboard layouts (in the files in
/usr/share/X11/xkb/symbols) that I simply cannot Add in the GUI where I configure my keyboard (
mate-keyboard-properties). The layouts are not shown to me.
I'm looking to add
Is there a simple config switch that I can throw to make them visible, or am I forced to manually edit XML to expose them as selectable?