Re: pg_dumpall problem - duplicated users

Hi,
i have similar problem - can't make dumps of any db with the same error message (and all applications using this pg
serverworks fine) . But in my case, i think, only user 'postgres' is duplicated: 

template1=> select * from pg_catalog.pg_shadow where usename = 'postgres';
 usename  | usesysid | usecreatedb | usesuper | usecatupd |               passwd                | valuntil | useconfig
----------+----------+-------------+----------+-----------+-------------------------------------+----------+-----------
 postgres |        1 | t           | t        | t         |                                     |          |
 postgres |        1 | t           | t        | t         | md5c084502ed11efa9d3d96d29717a5e555 |          |
(2 rows)

template1=> select * from pg_namespace ;
  nspname   | nspowner | nspacl
------------+----------+--------
 pg_catalog |        1 | {=U}
 pg_toast   |        1 | {=}
 public     |        1 | {=UC}
 pg_temp_1  |        1 |
(4 rows)

And every change i made to user postgres has effect to the one with passwd set. I can delete only him too. Someone can
help?Im running out of time so every advice will be appreciated. Maybe someone know how to delete whole pg_shadow table
andcreate users on db with no users at all (cause pg_shadow will be empty :). 

Thanks for any (and quick :) help,
greetings,

Bartek