gnome-icon-theme-extras software package provides GNOME Desktop icon theme (additional icons), you can install in your Ubuntu 17.04 (Zesty Zapus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gnome-icon-theme-extras
gnome-icon-theme-extras is installed in your system.
Make ensure the gnome-icon-theme-extras package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnome-icon-theme-extras *
You will get with gnome-icon-theme-extras package name, version, architecture and description in a table
| Distro | Ubuntu 17 04 zesty zapus |
| Section | GNOME |
| Package | gnome-icon-theme-extras |
| Version | 3.12.0-1ubuntu1 |
| Description | GNOME Desktop icon theme (additional icons) |
| Sub Section | GNOME |