Install gir1.2-mate-menu by entering the following commands in the terminal:
sudo apt update sudo apt install gir1.2-mate-menu
Description:
GObject introspection data for libmatemenu (transitional package)
This package is a transitional package to gir1.2-matemenu-2.0. The package can be safely removed.
Homepage: http://www.mate-desktop.org/
Version: 1.20.0-2
Section: universe/introspection