gnome-icon-theme-yasis software package provides YASIS (Yet Another Scalable Icon Set), 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-icon-theme-yasis
gnome-icon-theme-yasis is installed in your system.
Make ensure the gnome-icon-theme-yasis package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnome-icon-theme-yasis *
You will get with gnome-icon-theme-yasis package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | GNOME |
| Package | gnome-icon-theme-yasis |
| Version | 0.4.2-1 |
| Description | YASIS (Yet Another Scalable Icon Set) |
| Sub Section | GNOME |