Start postgresql in boot on Ubuntu 10.4

I installed Postgresql 8.4 from Ubuntu Software Center. I would like to make it start automatically on boot. Any tips? :)

From serverfault palto

• update-rc.d postgresql-8.4 defaults

  Make sure you read update-rc.d(8).

  palto : When I tried using this and it said postgresql is already supposed to start at boot. When viewing log files I noticed that there was error and that's why it doesn't start on boot. Still good to know this command if I need to setup other services to start at boot.
  From joschi