$ sudo apt-get update
$ sudo apt-get install php-horde-kronolith 

php-horde-kronolith is installed in your system.

Make ensure the php-horde-kronolith package were installed using the commands given below,

$ sudo dpkg-query -l | grep php-horde-kronolith *

You will get with php-horde-kronolith package name, version, architecture and description in a table

php-horde-kronolith package basic information: