Install libpng-sixlegs-java by entering the following commands in the terminal:
sudo apt update sudo apt install libpng-sixlegs-java
Description:
Sixlegs Java PNG Decoder
Sixlegs Java PNG Decoder is Java library for decoding PNG image files. Supports all valid bit depths (grayscale/color), interlacing, paletted images, alpha channel/transparency, gamma correction, access to most standard chunks, private chunk handling, and progressive display.
Homepage: http://www.sixlegs.com/software/png/
Version: 2.0-1
Section: universe/java