google-calendar

#source.list

deb http://ppa.launchpad.net/atareao/atareao/ubuntu trusty main

deb-src http://ppa.launchpad.net/atareao/atareao/ubuntu trusty main

#key

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 36FD5529

sudo apt update

sudo apt-get install calendar-indicator