ubuntu12.04 安装 ruby1.9.3
sudo apt-add-repository ppa:brightbox/ruby-ng sudo apt-get update
sudo apt-get install ruby rubygems ruby-switch
sudo apt-get install ruby1.9.1
sudo apt-add-repository ppa:brightbox/ruby-ng sudo apt-get update
sudo apt-get install ruby rubygems ruby-switch
sudo apt-get install ruby1.9.1