I believe this was already fixed back in June with https://obs.kolabsys.com/package/rdiff/Kolab:Winterfell/kolab?linkrev=base&rev=37.

Fixed. Thanks for the report.

I cannot reproduce the bug described in the first posting, so I'm closing this as resolved. Feel free to reopen this task if I've overlooked something.

We don't support Ubuntu 14.04.

I tried installing Kolab 16 (from OBS as of today) on Jessie.
From all the above issues I confirm issues 2.1, 5 and 6.

My users still like the classic skin, but use only mail.
Anyway, we must not break people's setup, so we either need to modify the user settings
when upgrading or alert the admin and help him fix his system.
So we need to do more than just removing the skin.

See also T2208.

We should also remove the old classic skin. Some kolab plugins just does not work with classic skin.

Thanks - it works for me.

The dependencies were fixes yesterday. 2FA was introduced to Kolab:16 some days ago

This was fixed in 66310b2fc46138.