title: How to install Ruby on Rails 3.0 on Ubuntu 10.10?
body: <p>After installing Ruby and Ruby Gems:</p>
  
  <pre><code>$ sudo apt-get install ruby rubygems
  ...
  $ ruby -v
  ruby 1.8.7 (2010-06-23 patchlevel 299) [i686-linux]
  $ gem -v
  1.3.7
  </code></pre>
  
  <p>If I try to install Rails I get an error, and even though it seems to be the documentation only, <code>rails</code> isn't installed:</p>
  
  <pre><code>$ sudo gem install rails
  ...
  Successfully installed rails-3.0.1
  24 gems installed
  ... 
  Installing ri documentation for builder-2.1.2...
  ERROR:  While generating documentation for builder-2.1.2
  ... MESSAGE:   Unhandled special: Special: type=17, text="&lt;!-- HI --&gt;"
  ... RDOC args: --ri --op /var/lib/gems/1.8/doc/builder-2.1.2/ri --title Builder -- Easy XML Building --main README --line-numbers --quiet lib CHANGES Rakefile README doc/releases/builder-1.2.4.rdoc doc/releases/builder-2.0.0.rdoc doc/releases/builder-2.1.1.rdoc --title builder-2.1.2 Documentation
  (continuing with the rest of the installation)
  ...
  Installing ri documentation for rails-3.0.1...
  File not found: lib
  
  $ rails -v
  The program 'rails' is currently not installed.  You can install it by typing:
  sudo apt-get install rails
  </code></pre>
  
  <p>Ubuntu repositories only have Rails 2.3.5 so that isn't an option.</p>
  
  <p>How do I get Rails to install properly?</p>
  
  <p><strong>Update:</strong> I tried the following, no error this time, but still no success: </p>
  
  <pre><code>$ sudo gem install rails --no-rdoc --no-ri
  Successfully installed rails-3.0.1
  1 gem installed
  $ rails -v
  The program 'rails' is currently not installed...
  </code></pre>
  
  <p><strong>Update 2:</strong> So, thanks to Maran and Jörg, I now know the problem is not that <code>rails</code> isn't installed, but it's not added to the <code>PATH</code>. This can be fixed by adding the following to <code>~/.bashrc</code>:</p>
  
  <pre><code>export PATH=/var/lib/gems/1.8/bin:$PATH
  </code></pre>
  
  <p>That raises a further question: What should have added that to the <code>PATH</code>? Presumably the <code>apt-get install rubygems</code>? And what else may be broken?</p>