Install libgtk2-gst by entering the following commands in the terminal:
sudo apt update sudo apt install libgtk2-gst
Description:
GTK+ bindings and environment for GNU Smalltalk
This package contains the GTK+ bindings for GNU Smalltalk. . For more information on the browser see the gnu-smalltalk-browser package.
Homepage: http://smalltalk.gnu.org
Version: 3.2.5-1.1
Section: universe/interpreters