$ sudo apt-get update
$ sudo apt-get install libgettext-rails-ruby 

libgettext-rails-ruby is installed in your system.

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

$ sudo dpkg-query -l | grep libgettext-rails-ruby *

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

libgettext-rails-ruby package basic information: