hud software package provides Backend for the Unity HUD, 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 hud
hud is installed in your system.
Make ensure the hud package were installed using the commands given below,
$ sudo dpkg-query -l | grep hud *
You will get with hud package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | GNOME |
| Package | hud |
| Version | 14.10+16.04.20160415-0ubuntu1 |
| Description | Backend for the Unity HUD |
| Sub Section | GNOME |