title: Where is Postgres 9.1 log located by default in Ubuntu
body: <p>Where I can find startup log of of my postgres 9.1 server.
  I'm using Ubuntu. 
  <code>postgres restart</code> gets failed.
  <code>find / -name pg_log</code> founds nothing
  standard log at <code>/etc/postgres/main/9.1/</code> is clear</p>