title: Error when creating unaccent extension on PostgreSQL
body: <p>I am trying to configure PostgreSQL to use fulltext search in my rails app as mentioned in this <a href="http://railscasts.com/episodes/343-full-text-search-in-postgresql">Railscast</a>.</p>
  
  <p>I am using a fresh <code>Ubuntu 12.04</code> server running <code>PostgreSQL 9.1.5</code> installed using <code>apt-get</code> with the <code>ppa:pitti/postgresql</code> with <code>precise</code>.</p>
  
  <p>I get the following error when trying to run the migration and when I try the same command in the psql console with the peer postgres user:</p>
  
  <pre><code>postgres=# CREATE EXTENSION unaccent;
  </code></pre>
  
  <blockquote>
    <p>ERROR:  could not open extension  control file "/usr/share/postgresql/9.1/extension/unaccent.control":<br>
    No such file or directory</p>
  </blockquote>
  
  <p>In my local box running <code>Ubuntu 10.04 desktop</code> I use the same repository (<code>natty</code>) and it works well.</p>
  
  <p>Any insights would be greatly appreciated.</p>