floatbg software package provides slowly modify the color of the X root window, 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 floatbg
floatbg is installed in your system.
Make ensure the floatbg package were installed using the commands given below,
$ sudo dpkg-query -l | grep floatbg *
You will get with floatbg package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | X Window System software |
| Package | floatbg |
| Version | 1.0-28 |
| Description | slowly modify the color of the X root window |
| Sub Section | X188 |