ubuntu rvm install ruby & rails

source ： http://ryanbigg.com/2010/12/ubuntu-ruby-rvm-rails-and-you/

1. git curl：

  sudo apt-get install build-essential git-core curl

2. rvm：

curl -L get.rvm.io | bash -s stable
echo '[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"' >> ~/.bashrc 

. ~/.bashrc

sudo apt-get install build-essential openssl libreadline6 libreadline6-dev 
sudo apt-get install curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 
sudo apt-get install libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison  
subversion

3. ruby：

rvm install 1.9.3

rvm use 1.9.3

rvm --default use 1.9.3

4. rails：

gem install rails -v 3.2.3

5. mysql：

sudo apt-get install libmysqlclient-dev