title: Need help getting rails server to work
body: <p>So I feel incredibly frustrated. I am doing www.railstutorial.org and they require a very specific version of rails (4.2.2). I have installed it as they wanted. Put in their Gemfile specs on their "hello_app" app they provided. When I run "rails server" I get an error message saying that "byebug" is erroring. I try to install earlier and later versions of bye bug and I get the same error message. Can someone please help me? I feel pretty lost. </p>
  
  <p>The tutorial is at the url below.</p>
  
  <p><a href="https://www.railstutorial.org/book/beginning#code-hello_action" rel="nofollow">https://www.railstutorial.org/book/beginning#code-hello_action</a></p>
  
  <pre><code> alopex@alopex-TH55-HD:~/workspace/hello_app$ more Gemfile
   source 'https://rubygems.org
  
   gem 'rails',                '4.2.2'
   gem 'sass-rails',           '5.0.2'
   gem 'uglifier',             '2.5.3'
   gem 'coffee-rails',         '4.1.0'
   gem 'jquery-rails',         '4.0.3'
   gem 'turbolinks',           '2.3.0'
   gem 'jbuilder',             '2.2.3'
   gem 'sdoc',                 '0.4.0', group: :doc
  
  group :development, :test do
   gem 'sqlite3',     '1.3.9'
   gem 'byebug',      '3.4.0'
   gem 'web-console', '2.0.0.beta3'
   gem 'spring',      '1.1.3'
  end
  
  alopex@alopex-TH55-HD:~/workspace/hello_app$ bundle install
  
   Gem::InstallError: byebug requires Ruby version &gt;= 2.0.0.
   An error occurred while installing byebug (3.4.0), and Bundler cannot  continue.
   Make sure that `gem install byebug -v '3.4.0'` succeeds before bundling.
  
   alopex@alopex-TH55-HD:~/workspace/hello_app$ sudo gem install byebug -v 3.4.0
   ERROR:  Error installing byebug:
   byebug requires Ruby version &gt;= 2.0.0.
  </code></pre>