avahi-ui-utils software package provides Avahi GTK+ utilities, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install avahi-ui-utils
avahi-ui-utils is installed in your system.
Make ensure the avahi-ui-utils package were installed using the commands given below,
$ sudo dpkg-query -l | grep avahi-ui-utils *
You will get with avahi-ui-utils package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Libraries |
| Package | avahi-ui-utils |
| Version | 0.6.32~rc+dfsg-1ubuntu2 |
| Description | Avahi GTK+ utilities |
| Sub Section | Libs |