To integrate google calendar events into your gnome desktop, go to google calendar, click on "settings" , then on the "calendars" tab and then on your calendar's name : Then, at the bottom there is a section called "private address:" > click on the "ical" green icon to get your private calendar url, Now all you have to do is open a terminal and paste this: /usr/lib/evolution-webcal/evolution-webcal url Replacing url with your ical private url you got in the step above. A window will pop up and here is where you can make the update frequency settings
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