Install gtk2.0-examples by entering the following commands in the terminal:
sudo apt update sudo apt install gtk2.0-examples
Description:
example files for GTK+ 2.0
GTK+ is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK+ is suitable for projects ranging from small one-off tools to complete application suites. . This package contains the example files and a demonstration program for GTK+-2.0.
Homepage: http://www.gtk.org/
Version: 2.24.32-1ubuntu1
Section: x11