aptitude install ruby1.9.1 rubygems1.9.1 libruby1.9.1 nginx mysql-server libmysql-ruby1.9.1 build-essential ruby1.9.1-dev libopenssl-ruby1.9.1 libssl-dev zlib1g-dev

gem install rubygems-update
ln /usr/bin/ruby1.9.1 /usr/bin/ruby
/var/lib/gems/1.9.1/gems/rubygems-update-1.3.7/bin/update_rubygems

gem install rails --pre --no-rdoc --no-ri
gem install passenger --no-rdoc --no-ri

passenger-install-nginx-module