前言
使用RVM来管理Ruby，建议使用同样的 Ubuntu 版本，以免遇到一些版本不同带来的问题。
参考
http://ruby-china.org/wiki/install-rails-on-ubuntu-12-04-server
配置 Ubuntu 系统
如果你是国内服务器，推荐修改网易的源
输入
sudo vi /etc/apt/sources.list将里面的内容替换成：deb http://mirrors.163.com/ubuntu/ precise main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ precise-security main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ precise-updates main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ precise-proposed main restricted universe multiversedeb http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ precise main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ precise-security main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ precise-updates main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ precise-proposed main restricted universe multiversedeb-src http://mirrors.163.com/ubuntu/ precise-backports main restricted universe multiverse然后更新一下:
sudo apt-get update安装必要的三方库
sudo apt-get install -y wget vim build-essential openssl libreadline6 libreadline6-dev libmysqlclient-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libxml2-dev libxslt-dev libcurl4-openssl-dev autoconf automake libtool imagemagick libmagickwand-dev libpcre3-dev nodejs libpq-dev
安装 Ruby
安装 RVM
$ \curl -L https://get.rvm.io | bash -s stable$ echo '[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"' >>~/.bashrc
$ source ~/.bashrc
$ rvm -v
安装 Ruby
如果你是国内服务器，推荐将 RVM 的安装源替换成 Taobao 的镜像服务器，这样安装能更快！
sed -i -e 's/ftp\.ruby-lang\.org\/pub\/ruby/ruby\.taobao\.org\/mirrors\/ruby/g' ~/.rvm/config/db
用 RVM 安装 Ruby:
$ rvm pkg install readline openssl
$ rvm install 2.0.0$ rvm use 2.0.0 --default
$ ruby -v
ruby 2.0.0p247
国内服务器推荐替换 RubyGems 的到淘宝镜像:$ gem sources --remove https://rubygems.org/$ gem sources -a http://ruby.taobao.org/$ gem sources -l
*** CURRENT SOURCES ***http://ruby.taobao.org来源：oschina
链接：https://my.oschina.net/u/1000656/blog/184412