title: Cannot load gem during gem pristine
body: <p>I am using rails on my local host and have recently been confronted with the following message.</p>
  
  <pre><code>Warning: You're using Rubygems 1.8.23 with Spring. Upgrade to at least Rubygems 2.1.0 and run `gem pristine --all` for better startup performance.  
  </code></pre>
  
  <p>Sounds fair enough, however when I run the suggested command, it hangs on installing the cairo gem with the following message.</p>
  
  <pre><code>Cached gem for cairo-1.12.8 not found, attempting to fetch...
  ERROR:  While executing gem ... (Gem::Exception)
      Cannot load gem at [/usr/share/rubygems-integration/1.9.1/cache/cairo-1.12.8.gem] in     /home/me/
  </code></pre>
  
  <p>What might be going on here?</p>