$ sudo apt-get update
$ sudo apt-get install libcalendarsupport4 

libcalendarsupport4 is installed in your system.

Make ensure the libcalendarsupport4 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libcalendarsupport4 *

You will get with libcalendarsupport4 package name, version, architecture and description in a table

libcalendarsupport4 package basic information: