diff -Nru update-manager-0.146/UpdateManager/UpdateManager.py update-manager-0.147/UpdateManager/UpdateManager.py
--- update-manager-0.146/UpdateManager/UpdateManager.py	2011-01-28 15:59:03.000000000 +0100
+++ update-manager-0.147/UpdateManager/UpdateManager.py	2011-02-23 10:58:14.000000000 +0100
@@ -734,7 +734,18 @@
                                    "/org/gnome/SessionManager")
         iface = dbus.Interface(proxy_obj, "org.gnome.SessionManager")
         iface.RequestReboot()
-        # FIXME: try sesion restart with hal?
+    except dbus.DBusException:
+        self._request_reboot_via_consolekit()
+    except:
+        pass
+
+  def _request_reboot_via_consolekit(self):
+    try:
+        bus = dbus.SystemBus()
+        proxy_obj = bus.get_object("org.freedesktop.ConsoleKit",
+                                   "/org/freedesktop/ConsoleKit/Manager")
+        iface = dbus.Interface(proxy_obj, "org.freedesktop.ConsoleKit.Manager")
+        iface.Restart()
     except dbus.DBusException, e:
         pass
 
diff -Nru update-manager-0.146/debian/changelog update-manager-0.147/debian/changelog
--- update-manager-0.146/debian/changelog	2011-02-16 21:19:12.000000000 +0100
+++ update-manager-0.147/debian/changelog	2011-02-23 10:59:44.000000000 +0100
@@ -1,3 +1,10 @@
+update-manager (1:0.147) UNRELEASED; urgency=low
+
+  * UpdateManager/UpdateManager.py: try to reboot using consolekit if
+    gnome-session isn't present.
+
+ -- Lionel Le Folgoc <mrpouit@ubuntu.com>  Wed, 23 Feb 2011 10:58:50 +0100
+
 update-manager (1:0.146) natty; urgency=low
 
   * DistUpgrade/DistUpgradeView*.py: