$ sudo apt-get update
$ sudo apt-get install ruby-eim-xml 

ruby-eim-xml is installed in your system.

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

$ sudo dpkg-query -l | grep ruby-eim-xml *

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

ruby-eim-xml package basic information: