Install gnustep-base-runtime by entering the following commands in the terminal:
sudo apt update sudo apt install gnustep-base-runtime
Description:
GNUstep Base library - daemons and tools
The GNUstep Base Library is a powerful fast library of general-purpose, non-graphical Objective C classes, inspired by the OpenStep API but implementing Apple and GNU additions to the API as well. . This package contains the runtime support files needed by GNUstep applications.
Homepage: http://gnustep.org
Version: 1.25.1-2ubuntu3
Section: universe/libs