Comment 90 for bug 34199

Yes, after installing the whole update set a few times I am also now ok and have been a few days.

I did experience the same problem as you re. calendar invitations showing up as emails with no way to accept/reject etc....

This seems to be due to the new evolution-plugins module, since as soon as I downgraded it from 2.22.2-0ubuntu1 (the most recent)
back to the previous version 2.22.1.1-0ubuntu3 my calendar invitations show up ok and work ok....