Here are some instructions to install Ruby on Rails using rbenv.
Update the sources
sudo apt-get update
Next, let us install the pre-requisites
sudo apt-get -y install git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev python-software-properties libffi-dev
Now we come to the Rbenv instructions, copy paste the following instructions on your shell.
git clone https://github.com/sstephenson/rbenv.git ~/.rbenv
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(rbenv init -)"' >> ~/.bashrc
Note: Zsh users please use ~/.zshrc in place of ~/.bashrc.``
git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc
exec $SHELL
git clone https://github.com/sstephenson/rbenv-gem-rehash.git ~/.rbenv/plugins/rbenv-gem-rehash
rbenv install 2.2.2
rbenv global 2.2.2
echo "gem: --no-ri --no-rdoc" > ~/.gemrc
gem install bundler
gem install rails
gem install therubyracer
rbenv rehash
Check if its installed correctly
rails -v
Thanks for reading! Hope this helped!