gnome-online-accounts (GOA) with Xubuntu?
Solution 1:
Took the plunge and installed the gnome-online-accounts. No adverse effects seen yet.
In order to use GOA you need to start gnome-control-center as follows:
$ env XDG_CURRENT_DESKTOP=GNOME gnome-control-center
to trick the desktop to believe it is running GNOME. Worked fine after that and provided Evolution in my case the right authentications for Gmail/Calender etc.