Install fookb by entering the following commands in the terminal:
sudo apt update sudo apt install fookb
Description:
Xkb state indicator
WindowMaker docked Xkb state indicator. Fookb can switch xkb groups and display a pixmap corresponding to the selected group. It also can execute a specified command upon the switch (for example, play sound).
Homepage: http://www.dockapps.net/fookb
Version: 4.0-1
Section: universe/x11