Install gir1.2-wnck-3.0 by entering the following commands in the terminal:
sudo apt update sudo apt install gir1.2-wnck-3.0
Description:
GObject introspection data for the WNCK library
This package contains introspection data for Window Navigator Construction Kit, a library to interact with window managers. . It can be used by packages using the GIRepository format to generate dynamic bindings.
Version: 3.24.1-2
Section: introspection