$ sudo apt-get update
$ sudo apt-get install libhtml-calendarmonth-perl 

libhtml-calendarmonth-perl is installed in your system.

Make ensure the libhtml-calendarmonth-perl package were installed using the commands given below,

$ sudo dpkg-query -l | grep libhtml-calendarmonth-perl *

You will get with libhtml-calendarmonth-perl package name, version, architecture and description in a table

libhtml-calendarmonth-perl package basic information: