What does error "psql: Kerberos 5 authentication not supported" means?

Hi Guys,

I tried to setup kerberos authentication with postgresql 8.4.7 on Ubuntu 10.10.

When I use:
$ psql –h ubuntu.server –U gavin dbname

I get following error:
psql: Kerberos 5 authentication not supported.

And from the server side of postgresql, I could see following log:

2011-03-23 09:14:17 PDT LOCATION: proc_exit_prepare, ipc.c:183
2011-03-23 09:14:17 PDT DEBUG: 00000: exit(0)
2011-03-23 09:14:17 PDT LOCATION: proc_exit, ipc.c:135
2011-03-23 09:14:17 PDT DEBUG: 00000: shmem_exit(-1): 0 callbacks to make
2011-03-23 09:14:17 PDT LOCATION: shmem_exit, ipc.c:211
2011-03-23 09:14:17 PDT DEBUG: 00000: proc_exit(-1): 0 callbacks to make
2011-03-23 09:14:17 PDT LOCATION: proc_exit_prepare, ipc.c:183
2011-03-23 09:14:17 PDT DEBUG: 00000: reaping dead processes
2011-03-23 09:14:17 PDT LOCATION: reaper, postmaster.c:2243
2011-03-23 09:14:17 PDT DEBUG: 00000: server process (PID 4592) exited with exit code 0
2011-03-23 09:14:17 PDT LOCATION: LogChildExit, postmaster.c:2725
2011-03-23 09:14:24 PDT LOG: 00000: Kerberos recvauth returned error 103
2011-03-23 09:14:24 PDT LOCATION: pg_krb5_recvauth, auth.c:721
postgres: Software caused connection abort from krb5_recvauth
2011-03-23 09:14:24 PDT FATAL: 28000: Kerberos 5 authentication failed for user "gavin"
2011-03-23 09:14:24 PDT LOCATION: auth_failed, auth.c:273
2011-03-23 09:14:24 PDT DEBUG: 00000: shmem_exit(1): 0 callbacks to make
2011-03-23 09:14:24 PDT LOCATION: shmem_exit, ipc.c:211
2011-03-23 09:14:24 PDT DEBUG: 00000: proc_exit(1): 1 callbacks to make
2011-03-23 09:14:24 PDT LOCATION: proc_exit_prepare, ipc.c:183
2011-03-23 09:14:24 PDT DEBUG: 00000: exit(1)
2011-03-23 09:14:24 PDT LOCATION: proc_exit, ipc.c:135
2011-03-23 09:14:24 PDT DEBUG: 00000: shmem_exit(-1): 0 callbacks to make
2011-03-23 09:14:24 PDT LOCATION: shmem_exit, ipc.c:211
2011-03-23 09:14:24 PDT DEBUG: 00000: proc_exit(-1): 0 callbacks to make
2011-03-23 09:14:24 PDT LOCATION: proc_exit_prepare, ipc.c:183
2011-03-23 09:14:24 PDT DEBUG: 00000: reaping dead processes

What does this means and how could I get more verbose logs?

Besides, is there any more howto/doc on integrate kerberos and postgresql besides the official documentation at http://www.postgresql.org/docs/9.0/interactive/client-authentication.html?

Thanks very much in advance!

Regards,
Yandong