title: python ubuntu virtualenv -> error
body: <p>Newbie here, be kind.</p>
  
  <p>The other day I am all:</p>
  
  <pre><code>sudo apt-get install python-virtualenv
  </code></pre>
  
  <p>And then I am (following instructions):</p>
  
  <pre><code>virtualenv env
  </code></pre>
  
  <p>And Ubuntu 10.10 is like:</p>
  
  <pre><code>Traceback (most recent call last):
    File "/usr/local/bin/virtualenv", line 5, in &lt;module&gt;
      from pkg_resources import load_entry_point
    File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 2675, in &lt;module&gt;
      parse_requirements(__requires__), Environment()
    File "/usr/lib/python2.6/dist-packages/pkg_resources.py", line 552, in resolve
      raise DistributionNotFound(req)
  pkg_resources.DistributionNotFound: virtualenv==1.5.1
  </code></pre>
  
  <p>What gives?</p>