Install libgupnp-igd-1.0-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libgupnp-igd-1.0-doc
Description:
library to handle UPnP IGD port mapping - documentation
A GObject-based API for controlling UPnP Internet Gateway Devices port mapping. . This package contains the documentation.
Homepage: https://wiki.gnome.org/Projects/GUPnP
Version: 0.2.5-1
Section: universe/doc