Rubyまわりをインストール

sudo apt-get install apache2

sudo apt-get install ruby1.8-elisp libapache2-mod-ruby ruby1.8 ruby1.8-dev rubygems libopenssl-ruby sqlite3 libsqlite3-ruby libsqlite-ruby libxml2-dev libxslt1-dev libgemplugin-ruby

sudo gem install rails --include-dependencies
sudo gem sources -a http://gems.github.com
sudo gem install twitter --include-dependencies
sudo gem install echoe simple-rss feed-normalizer nokogiri mechanize mongrel mongrel_cluster pit