Installing Ruby 2.2 and Ruby on Rails 4.2, on Ubuntu 15.10

gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3

\curl -sSL https://get.rvm.io | bash -s stable --rails

source ~/.rvm/scripts/rvm

rvm requirements

rvm install ruby

rvm use ruby --default

rvm rubygems current

gem install rails