Install kunststoff by entering the following commands in the terminal:
sudo apt update sudo apt install kunststoff
Description:
suite of skins for different applications
The Kunststoff Look & Feel is a completely free Look & Feel for Java Swing applications. It supports many widgets (e.g JInnerFrame, JProgressBar, JToolBar) and provides customizable gradient colors.
Homepage: http://kunstoff.incors.com/archive/
Version: 2.0.2-5
Section: universe/utils