gnunet-server software package provides transitional dummy package, 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 gnunet-server
gnunet-server is installed in your system.
Make ensure the gnunet-server package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnunet-server *
You will get with gnunet-server package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Network |
| Package | gnunet-server |
| Version | 0.10.1-2.1build2 |
| Description | transitional dummy package |
| Sub Section | Net |