Just to be clear. I install Kopano on my PRODUCTION systems regularly on Debian and I have ZERO missing packages nor errors.
I just install them, run the dependencies and it just works.
you also have to remember that what's available for the community at their download site is the main development branch not the official releases which are reserved for customers. That said I never had any issues and I do run mainbranch in production
I use it for work the entire day and every single email I send or receive, including cloud, videoconferencing and so on, is via Kopano.
I did say that I am not sure whether Ubuntu 16.10 does work, the packages are for Ubuntu 16.04
I am pretty sure packages do work otherwise it would be all over the place on the kopano forums website.
If you have issues with the packages I would recommend you talking directly to the developers in the kopano forums:
Or otherwise send an e-mail to support@kopano.com
All I can speak is from my own experience. I am not trying to convince you to use Kopano or otherwise as I do not have any shares in the company nor I am one of their developers.
I can only speak from my own experience and despite me digging around everywhere else (including Zimbra) I have not found a product which gives me the same features in the community.
I have also been successful in building the webapp and plugins code from scratch myself again with little difficulty.