gem-plugin-jpeg binary package in Ubuntu Bionic amd64

 Gem is a loadable library for Pure Data (Pd), which adds OpenGL graphics
 rendering and animation to Pd. Pd is a graphical programming language and
 computer music system.
 .
 This package provides image input and output using the libjpeg library.
 If you have installed the gem-plugin-magick package as well, you might find
 that you don't need this package as you can already read and write jpeg images.

Source package