GDM take a while to launch gnome

Every first login after boot, I get the brown ubuntu screen during 55s before gnome starts...
I've tried remove gdm with the --purge option and reinstall it but nothing change...
The log form gdm seems to show something strange :

X Window System Version 7.2.0
Release Date: 22 January 2007
X Protocol Version 11, Revision 0, Release 7.2
Build Operating System: Linux Ubuntu
Current Operating System: Linux inflames-laptop 2.6.20-16-generic #2 SMP Thu Jun 7 20:19:32 UTC 2007 i686
Build Date: 04 April 2007
 Before reporting problems, check http://wiki.x.org
 to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
 (++) from command line, (!!) notice, (II) informational,
 (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Tue Jul 10 14:48:56 2007
(==) Using config file: "/etc/X11/xorg.conf"
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning: Type "ONE_LEVEL" has 1 levels, but <RALT> has 2 symbols
> Ignoring extra symbols
Errors from xkbcomp are not fatal to the X server
Synaptics DeviceInit called
SynapticsCtrl called.
Synaptics DeviceOn called
Could not init font path element /usr/X11R6/lib/X11/fonts/misc, removing from list!
Could not init font path element /usr/share/fonts/X11/cyrillic, removing from list!
Could not init font path element /usr/X11R6/lib/X11/fonts/Type1, removing from list!
Synaptics DeviceOff called
Synaptics DeviceOn called
ProcXCloseDevice to close or not ?
SetClientVersion: 0 9
AUDIT: Tue Jul 10 14:57:34 2007: 6362 X: client 27 rejected from IP 127.0.0.1
AUDIT: Tue Jul 10 14:57:39 2007: 6362 X: client 27 rejected from IP 127.0.0.1
AUDIT: Tue Jul 10 14:57:49 2007: 6362 X: client 27 rejected from IP 127.0.0.1
AUDIT: Tue Jul 10 14:57:54 2007: 6362 X: client 27 rejected from IP 127.0.0.1
Synaptics DeviceOff called
FreeFontPath: FPE "/usr/share/fonts/X11/misc" refcount is 2, should be 1; fixing.

So I've tried to enable/disable the TCP and the distant connection with gdmsetup but, again, nothing change.
For information, here is my gdm.conf-custom :

# GDM Configuration Customization file.
#
# This file is the appropriate place for specifying your customizations to the
# GDM configuration. If you run gdmsetup, it will automatically edit this
# file for you and will cause the daemon and any running GDM GUI programs to
# automatically update with the new configuration. Not all configuration
# options are supported by gdmsetup, so to modify some values it may be
# necessary to modify this file directly by hand.
#
# Older versions of GDM used the "gdm.conf" file for configuration. If your
# system has an old gdm.conf file on the system, it will be used instead of
# this file - so changes made to this file will not take effect. Consider
# migrating your configuration to this file and removing the gdm.conf file.
#
# To hand-edit this file, simply add or modify the key=value combination in
# the appropriate section in the template below. Refer to the comments in the
# /usr/share/gdm/defaults.conf file for information about each option. Also
# refer to the reference documentation.
#
# If you hand edit a GDM configuration file, you should run the following
# command to get the GDM daemon to notice the change. Any running GDM GUI
# programs will also be notified to update with the new configuration.
#
# gdmflexiserver --command="UPDATE_CONFIG <configuration key>"
#
# e.g, the "Enable" key in the "[debug]" section would be "debug/Enable".
#
# You can also run gdm-restart or gdm-safe-restart to cause GDM to restart and
# re-read the new configuration settings. You can also restart GDM by sending
# a HUP or USR1 signal to the daemon. HUP behaves like gdm-restart and causes
# any user session started by GDM to exit immediately while USR1 behaves like
# gdm-safe-restart and will wait until all users log out before restarting GDM.
#
# For full reference documentation see the gnome help browser under
# GNOME|System category. You can also find the docs in HTML form on
# http://www.gnome.org/projects/gdm/
#
# NOTE: Lines that begin with "#" are considered comments.
#
# Have fun!

[daemon]
AutomaticLogin=inflames
AlwaysLoginCurrentSession=false
DefaultSession=gnome.desktop
AlwaysRestartServer=true
RemoteGreeter=/usr/lib/gdm/gdmgreeter

[security]
NeverPlaceCookiesOnNFS=false
DisallowTCP=false
CheckDirOwner=false

[xdmcp]

[gui]
GtkRC=

[greeter]
GraphicalTheme=Avio-GDM
GraphicalThemes=happygnome/:circles
Use24Clock=oui

[chooser]

[debug]
Enable=true

[servers]
0=Standard

[server-Standard]
name=Standard server
command=/usr/X11R6/bin/X -br -audit 0
flexible=true