how to install ruby in ubuntu 14.04

One. Install ruby-install

wget -O ruby-install-0.6.0.tar.gz https://github.com/postmodern/ruby-install/archive/v0.6.0.tar.gz
tar -xzvf ruby-install-0.6.0.tar.gz
cd ruby-install-0.6.0/
sudo make install

Two. Install ruby

ruby-install
ruby-install 2.3.1