ubuntu12.04 安装 ruby1.9.3

参考文章：http://blog.brightbox.co.uk/posts/next-generation-ruby-packages-for-ubuntu

sudo apt-add-repository ppa:brightbox/ruby-ngsudo apt-get update

and you can install or upgrade ruby like this:

sudo apt-get install ruby rubygems ruby-switch

If you’re upgrading, some packages have been replaced so you will see apt removing some packages (such as rubygems1.8, irb1.8 and others) – don’t panic :)

To install Ruby 1.9.3:

sudo apt-get install ruby1.9.1