Install libpgf6 by entering the following commands in the terminal:
sudo apt update sudo apt install libpgf6
Description:
Progressive Graphics File (PGF) library - runtime files
libpgf is a library implementing an interface for handling PGF (Progressive Graphic File) format files. . This package contains runtime library files needed to run software using libpgf.
Homepage: http://www.libpgf.org/
Version: 6.14.12-3.2
Section: universe/libs