Here some good advises how to install Rails on Ubuntu 9.04: Installing Ruby on Rails on Debian/Ubuntu
After I finished the installation I created a new app and tried to start up the development server. That failed with below message:
/usr/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/initializer.rb:159:in `require_frameworks': no such file to load -- openssl (RuntimeError)
To fix this you need to install OpenSSL:
sudo apt-get install openssl sudo apt-get install libopenssl-ruby
After that WEBrick started up without issues and served the standard welcome page.
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