You can install latest version ruby in Ubuntu 14.04 by this command
sudo apt-get install software-properties-common
sudo add-apt-repository ppa:brightbox/ruby-ng
sudo apt-get update
sudo apt-get -y install ruby2.1 ruby-switch ruby2.1-dev ri2.1 libruby2.1 libssl-dev zlib1g-dev
sudo ruby-switch –set ruby2.1
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