install ruby

ruby.sh

# Update APT package index
sudo apt-get update

# Install prerequisites
sudo apt-get install -y git curl zlib1g-dev subversion

sudo apt-get install -y openssl libreadline6-dev git-core zlib1g libssl-dev
sudo apt-get install -y libyaml-dev libsqlite3-dev sqlite3
sudo apt-get install -y libxml2-dev libxslt-dev
sudo apt-get install -y autoconf automake libtool bison

curl -L get.rvm.io | bash -s stable --rails