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The Ruby version is 2.2.1, while the Rails version is 4.2.0, running on Ubuntu 14.04.2 LTS.
root@Ubuntu14042-64b-RubyRails:~# ruby -vruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
root@Ubuntu14042-64b-RubyRails:~# rails -vRails 4.2.0