Install libpng-sixlegs-java-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libpng-sixlegs-java-doc
Description:
Documentation for Sixlegs Java PNG Decoder
This package contains documentation and examples for Sixlegs Java PNG Decoder library.
Homepage: http://www.sixlegs.com/software/png/
Version: 2.0-1
Section: universe/doc