Kolab 16 on Ubuntu 16.04

[Aleksander Machniak]

In case you didn't notice. The installation is possible since the last
weekend. There might be still some issues with PHP7 that cause mostly
warnings in logs (I already fixed some, but they're not yet packaged),
but it looks that it's working fine.

https://docs.kolab.org/installation-guide/ubuntu-16.04.html