Unity greeter show the cursor 0.2 seconds and end

Maybe something goes bad during some updates. If I want to use lightdm, I needed to fallback to lightdm-gtk-greeter instead of unity-greeter.

Here is my config files:
$ find /etc/lightdm/
/etc/lightdm/
/etc/lightdm/lightdm.conf.d
/etc/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
/etc/lightdm/lightdm.conf.d/50-xserver-command.conf
/etc/lightdm/lightdm.conf.d/50-unity-greeter.conf
/etc/lightdm/users.conf
/etc/lightdm/lightdm-gtk-greeter-ubuntu.conf
/etc/lightdm/lightdm-gtk-greeter.conf

From the log I can read in /var/log/lightdm/x-0-greeter.log:
Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
[..]
[+0,21s] WARNING: Failed to open configuration file: Aucun fichier ou dossier de ce type
[+0,21s] WARNING: Failed to open sessions directory: Erreur à l'ouverture du répertoire « /usr/share/lightdm/sessions » : Aucun fichier ou dossier de ce type
[..]
[+0,22s] DEBUG: unity-greeter.vala:506: Showing greeter
[+0,22s] DEBUG: unity-greeter.vala:194: Showing main window

(gnome-settings-daemon:1902): Gdk-WARNING **: gnome-settings-daemon: Fatal IO error 11 (Ressource temporairement non disponible) on X server :0.
[END]

Wheras in /var/log/lightdm/x-0.log:
(EE) Server terminated successfully (0). Closing log file.
[END]

$ dpkg -l | awk '{print $2}' | egrep -i "(lightdm|greeter)"
liblightdm-gobject-1-0
lightdm
lightdm-gtk-greeter
lightdm-remote-session-freerdp
lightdm-remote-session-uccsconfigure
unity-greeter

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: unity-greeter 13.10.3-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-8.15-generic 3.11.1
Uname: Linux 3.11.0-8-generic i686
ApportVersion: 2.12.5-0ubuntu2
Architecture: i386
Date: Sat Oct 19 09:26:22 2013
InstallationDate: Installed on 2013-07-01 (109 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha i386 (20130701)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: unity-greeter
UpgradeStatus: No upgrade log present (probably fresh install)