title: Ruby installation fails
body: <p>I tried to re-install Ruby using rvm . When I tried irb, this came up:</p>
  
  <pre><code>&lt;internal:gem_prelude&gt;:1:in `require': cannot load such file -- rubygems.rb (LoadError)
  from &lt;internal:gem_prelude&gt;:1:in `&lt;compiled&gt;'
  </code></pre>
  
  <p>please help</p>