title: pg_log directory for postgresql in ubuntu?
body: <p>I followed instruction on <a href="http://pydanny-event-notes.readthedocs.org/en/latest/DjangoConEurope2012/10-steps-to-better-postgresql-performance.html" rel="noreferrer">http://pydanny-event-notes.readthedocs.org/en/latest/DjangoConEurope2012/10-steps-to-better-postgresql-performance.html</a></p>
  
  <p>it says to set <code>log_directory = pg_log</code> </p>
  
  <p>where's that directory in ubuntu? :(</p>