1、安裝所需依賴
sudo apt-get update
sudo apt-get 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

2、安裝git sudo apt-get install git

3、http://stackoverflow.com/questions/26595620/how-to-install-ruby-2-1-4-on-ubuntu-14-04

　　下載rbenv 並設置好環境變量：

git clone https://github.com/rbenv/rbenv.git ~/.rbenv
echo ‘export PATH="$HOME/.rbenv/bin:$PATH"‘ >> ~/.bashrc
echo ‘eval "$(rbenv init -)"‘ >> ~/.bashrc
exec $SHELL

下載ruby源碼 設置環境變量

git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
echo ‘export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"‘ >> ~/.bashrc
exec $SHELL
 

安裝：

rbenv install 2.3.1
rbenv global 2.3.1
ruby -v

rbenv --》ruby envirement 大概是這兩個單詞的縮寫，用來配置ruby的環境和安裝的

ubuntu 安裝ruby