Using: Configure Dolphin -> Services -> Download New Services to have a way to send file by Thunderbird, I got: "Caricamento dei fornitori dal file http://download.kde.org/ocs/providers.xml non riuscito" that is something like "error loading providers from file: http://download.kde.org/ocs/providers.xml" This file is not reachable by a browser: no ocs directory is present in http://download.kde.org/ but this file is present as https://autoconfig.kde.org/ocs/providers.xml (I don't know if it's the same) I'm using Kubuntu 17.04
That URL looks reachable to me, and the UI works fine in Dolphin from git master.
(In reply to Nate Graham from comment #1) > That URL looks reachable to me, and the UI works fine in Dolphin from git > master. Ok. I checked that it's a problem due to my corporate's proxy