Ubuntu に入ってるPostgreSQL のデフォルトポートは5433

/etc/postgresql/8.3/main/postgresql.conf

(snip)

#------------------------------------------------------------------------------

# CONNECTIONS AND AUTHENTICATION

#------------------------------------------------------------------------------

 

# - Connection Settings -

 

#listen_addresses = 'localhost'		# what IP address(es) to listen on;

					# comma-separated list of addresses;

					# defaults to 'localhost', '*' = all

					# (change requires restart)

#port = 5433				# (change requires restart)

port = 5432				# (change requires restart)

max_connections = 100			# (change requires restart)

# Note:  Increasing max_connections costs ~400 bytes of shared memory per

5432 に統一する。

~$ sudo /etc/init.d/postgresql-8.3  restart

 * Restarting PostgreSQL 8.3 database server                      [ OK ]