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Установка одной строкой

Указанные команды ставят Ruby on Rails. 

sudo apt-get install mysql-server-5.1 mysql-client-5.1 libmysql-ruby libmysqlclient-dev ruby1.8 ruby1.8-dev libruby1.8-extras libdbd-mysql-ruby1.8 rubygems1.8 rubygems-doc; sudo gem install tzinfo builder memcache-client rack rack-test erubis mail text-format bundler thor i18n sqlite3-ruby; sudo gem install rack-mount --version=0.4.0; sudo gem install rails --version=3.0.0; ln -s /var/lib/gems/1.8/bin/rails /usr/local/bin/rails; ln -s /var/lib/gems/1.8/bin/bundle /usr/local/bin/bundle; ln -s /var/lib/gems/1.8/bin/rake /usr/local/bin/rake;

Источник: http://tokarchuk.ru/2010/11/fast-install-ruby-on-rails-3-from-packets-on-ubuntu/