aiccu software package provides SixXS Automatic IPv6 Connectivity Client Utility, 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 aiccu
aiccu is installed in your system.
Make ensure the aiccu package were installed using the commands given below,
$ sudo dpkg-query -l | grep aiccu *
You will get with aiccu package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Network |
| Package | aiccu |
| Version | 20070115-15.3ubuntu2 |
| Description | SixXS Automatic IPv6 Connectivity Client Utility |
| Sub Section | Net |