Latest Ruby Ubuntu 14.04 Installation Guide
You are Welcome! The Guide Shows You Step-by-Step How to Install the Latest Ruby on Ubuntu 14.04 Trusty LTS 32/64-bit GNU/Linux Desktop/Server.
First of All to Install the Latest Ruby in Ubuntu 14.04 follow the instructions to Setup the PPA Repository.
And Ruby Ruby is a language of careful balance. Its creator, Yukihiro “Matz” Matsumoto, blended parts of his favorite languages (Perl, Smalltalk, Eiffel, Ada, and Lisp) to form a new language that balanced functional programming with imperative programming.
Finally, included you find instructions on How to Getting-Started Easily Learning Ruby Programming on Ubuntu Linux.

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How to Add Latest Ruby Repo for Ubuntu
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Then to Install the Latest Ruby for Ubuntu
First to Look up All Available Ubuntu Versions do:
apt search ruby | grep ruby
Then to Install Ruby 2.5:
sudo apt install ruby2.5
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How to Getting-Started with Ruby on Ubuntu Linux
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