gnome-colors-common software package provides common icons for all GNOME-Colors icon themes, 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-colors-common
gnome-colors-common is installed in your system.
Make ensure the gnome-colors-common package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnome-colors-common *
You will get with gnome-colors-common package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | GNOME |
| Package | gnome-colors-common |
| Version | 5.5.1-2ubuntu2 |
| Description | common icons for all GNOME-Colors icon themes |
| Sub Section | GNOME |