Install libavahi-ui-gtk3-0 by entering the following commands in the terminal:
sudo apt update sudo apt install libavahi-ui-gtk3-0
Description:
Avahi GTK+ User interface library for GTK3
Avahi is a fully LGPL framework for Multicast DNS Service Discovery. It allows programs to publish and discover services and hosts running on a local network with no specific configuration. For example you can plug into a network and instantly find printers to print to, files to look at and people to talk to. . This library contains a GTK+ widget for browsing services.
Homepage: http://avahi.org/
Version: 0.7-3.1ubuntu1
Section: libs