I'm using Cinnamon 5.0.7 and try to install an additional keyboard layout (I have some defined already), which worked fine some time ago.
Now adding is disabled -- the + button is greyed-out. After some digging, I found a trace back from /usr/lib/x86_64-linux-gnu/cinnamon-settings-daemon/csd-keyboard
, but I don't know what to make of it.
Any suggestions what to try next?