$ sudo apt-get update
$ sudo apt-get install postgres-xc-plperl 

postgres-xc-plperl is installed in your system.

Make ensure the postgres-xc-plperl package were installed using the commands given below,

$ sudo dpkg-query -l | grep postgres-xc-plperl *

You will get with postgres-xc-plperl package name, version, architecture and description in a table

postgres-xc-plperl package basic information: