Install avahi-ui-utils by entering the following commands in the terminal:
sudo apt update sudo apt install avahi-ui-utils
Avahi GTK+ utilities
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 package contains some small GTK+ utilities to discover ssh and vnc servers.