libruby2.5 2.5.1-5ubuntu4 (s390x binary) in ubuntu cosmic

 Ruby is the interpreted scripting language for quick and easy
 object-oriented programming. It has many features to process text
 files and to do system management tasks (as in perl). It is simple,
 straight-forward, and extensible.
 .
 This package includes the 'libruby-2.5' library, necessary to run Ruby 2.5.
 (API version 2.5.0)