$ sudo apt-get update
$ sudo apt-get install libcgi-ssi-parser-perl 

libcgi-ssi-parser-perl is installed in your system.

Make ensure the libcgi-ssi-parser-perl package were installed using the commands given below,

$ sudo dpkg-query -l | grep libcgi-ssi-parser-perl *

You will get with libcgi-ssi-parser-perl package name, version, architecture and description in a table

libcgi-ssi-parser-perl package basic information: