title: update to rails 3 on ubuntu
body: <p>Hopefully this is an easy one - I'm trying to install rails on my netbook. I can#'t seem to get it to update to rails 3 (seems stuck on 2.3.5). Here's some terminal output to show you what I mean...</p>
  
  <pre><code>mike@Ubuntu-Netbook:~$ rails -v
  Rails 2.3.5
  mike@Ubuntu-Netbook:~$ gem update rails
  Updating installed gems
  Nothing to update
  mike@Ubuntu-Netbook:~$ sudo gem install rails
  [sudo] password for mike: 
  Successfully installed rails-3.1.0
  1 gem installed
  Installing ri documentation for rails-3.1.0...
  file 'lib' not found
  Installing RDoc documentation for rails-3.1.0...
  file 'lib' not found
  mike@Ubuntu-Netbook:~$ rails -v
  Rails 2.3.5
  </code></pre>
  
  <p>See? Stuck at 2.3.5! I have done a whole bunch of rails installs on other machines and never had this problem before - what am I missing? </p>
  
  <p>The 2.3.5 install is completely working.</p>
  
  <p>EDIT: I did not get an answer to this question. I got around it by investigating rvm and installing that way instead.</p>