Install gnustep-icons by entering the following commands in the terminal:
sudo apt update sudo apt install gnustep-icons
Description:
Several free icons for use with GNUstep and others
They all have a basic NeXTSTEPish look and feel. These icons are placed where the WindowMaker package expects them by default.
Homepage: https://github.com/alexmyczko/gnustep-icons
Version: 1.0-6
Section: universe/x11