Integrate google calendar into your gnome calendar

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