Install gir1.2-gepub-0.6 by entering the following commands in the terminal:
sudo apt update sudo apt install gir1.2-gepub-0.6
Description:
GObject introspection data for the libgepub library
libgepub is a GObject based library for handling and rendering epub documents. . This package contains the introspection data for the libgepub library.
Version: 0.6.0-1
Section: universe/introspection