gnome-humility-icon-theme software package provides humility icon theme for gnome, 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 gnome-humility-icon-theme
gnome-humility-icon-theme is installed in your system.
Make ensure the gnome-humility-icon-theme package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnome-humility-icon-theme *
You will get with gnome-humility-icon-theme package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | GNOME |
| Package | gnome-humility-icon-theme |
| Version | 0.3-0ubuntu1 |
| Description | humility icon theme for gnome |
| Sub Section | GNOME |