It's still unclear chat error you get if you try to add your calendar through the online account settings, could you describe the exact steps you are using and the error you get?
** Changed in: gnome-control-center (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/1722455 Title: Creation of mail/contact/calendar accounts impossible Status in gnome-control-center package in Ubuntu: Incomplete Bug description: If one wants to use Gnome Calendar or Gnome Contacts one has to create accounts to access the server. Gnome control centre provides prepared account templates for common public providers. There is an IMAP template that is broken (does not allow to connect to inhouse mail servers). Also adding Calendar or Contact connection is not possible. In Gnome Calendar adding new calendars is impossible (there is a workaround by temporarily installing California but that is very unstable). There needs to be a way to install DAV connectors to CALDav and CARDDav as is possible in Thunderbird. Possible workaround (which is not stable): Under ~/.config/evolution one can add a text file containing the configuration to the required service. As there is no refresh function in Calendar or Contacts, this is a fragile solution though (requires constant session creation aka logout/login) ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: gnome-control-center 1:3.26.1-0ubuntu1 ProcVersionSignature: Ubuntu 4.13.0-15.16-generic 4.13.4 Uname: Linux 4.13.0-15-generic x86_64 ApportVersion: 2.20.7-0ubuntu2 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Tue Oct 10 08:11:26 2017 InstallationDate: Installed on 2017-09-05 (34 days ago) InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170902) SourcePackage: gnome-control-center UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1722455/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp