ruby2.5 2.5.1-5ubuntu4 (amd64 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.
 .
 In the name of this package, `2.5' indicates the Ruby library compatibility
 version. This package currently provides the `2.5.x' branch of Ruby.