Ruby install

https://www.digitalocean.com/community/tutorials/how-to-install-ruby-on-rails-on-ubuntu-12-04-lts-precise-pangolin-with-rvm
#Install rbenv and dependencies

sudo apt-get update

sudo apt-add-repository -y ppa:chris-lea/node.js
sudo apt-get install python-software-properties

sudo apt-get -y update
sudo apt-get -y install curl git-core nodejs

curl https://raw.githubusercontent.com/fesplugas/rbenv-installer/master/bin/rbenv-installer | bash

nano ~/.bashrc

export RBENV_ROOT="${HOME}/.rbenv"
if [ -d "${RBENV_ROOT}" ]; then
  export PATH="${RBENV_ROOT}/bin:${PATH}"
  eval "$(rbenv init -)"
fi

#reload the shell.

source ~/.bashrc

# install the dependencies (using the installer tool),

rbenv bootstrap-ubuntu-12-04

curl -fsSL https://gist.github.com/mislav/055441129184a1512bb5.txt | \
  rbenv install --patch 2.2.3