$ sudo apt-get update
$ sudo apt-get install libdpkg-ruby 

libdpkg-ruby is installed in your system.

Make ensure the libdpkg-ruby package were installed using the commands given below,

$ sudo dpkg-query -l | grep libdpkg-ruby *

You will get with libdpkg-ruby package name, version, architecture and description in a table

libdpkg-ruby package basic information: