Ubuntu 14.04 comes with the version 1.9 of Ruby. I need a new version of Ruby. To install any version of 2.0 - 2.3, we can use the brightbox repository as follows,
$ sudo apt-add-repository ppa:brightbox/ruby-ng
$ sudo apt-get update
$ sudo apt-get install ruby2.3 # or ruby2.2
$ sudo apt-get install ruby2.3-dev
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