Install gir1.2-matekbd-1.0 by entering the following commands in the terminal:
sudo apt update sudo apt install gir1.2-matekbd-1.0
Description:
GObject introspection data for libmatekbd and libmatekbdui
libmatekbd offers an API to manage the keyboard in MATE applications. . libmatekbdui offers an API to display a graphical user interface for libmatekbd operations. . This package contains introspection data for the libmatekbd and the libmatekbdui libraries. . It can be used by packages using the GIRepository format to generate dynamic bindings.
Homepage: http://www.mate-desktop.org/
Version: 1.20.1-1
Section: universe/introspection