Installing Calendar Indicator
To install this program in Ubuntu, just open up the Terminal and paste this code:
sudo add-apt-repository ppa:atareao/atareao
This will add the repository securely. Once you’ve added it, update your package manager and install “calendar-indicator“. If your Terminal is still open, you can do both those things with these two commands:
sudo apt-get update
sudo apt-get install calendar-indicator
This program has one major shortcoming – it doesn’t support multiple calendars. If you use Google Calendar for more than the default calendar, you’re out of luck (though I hope this changes in future versions!)