kdeartwork-theme-icon software package provides additional 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 kdeartwork-theme-icon
kdeartwork-theme-icon is installed in your system.
Make ensure the kdeartwork-theme-icon package were installed using the commands given below,
$ sudo dpkg-query -l | grep kdeartwork-theme-icon *
You will get with kdeartwork-theme-icon package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | KDE |
| Package | kdeartwork-theme-icon |
| Version | 4:15.08.2-0ubuntu1 |
| Description | additional icon themes |
| Sub Section | KDE |