plymouth has been deactivated before, so just quit it for now.
Bug-Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=632737
Bug: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/799069
-Index: lightdm-0.9.4/src/xserver-local.c
-===================================================================
---- lightdm-0.9.4.orig/src/xserver-local.c 2011-07-25 13:36:24.000000000 +0200
-+++ lightdm-0.9.4/src/xserver-local.c 2011-08-25 17:50:19.955409416 +0200
-@@ -115,7 +115,7 @@
+--- a/src/xserver-local.c
++++ b/src/xserver-local.c
+@@ -142,7 +142,7 @@ xserver_local_new (void)
g_debug ("X server %s will replace Plymouth", xserver_get_address (XSERVER (self)));
self->priv->replacing_plymouth = TRUE;
self->priv->vt = active_vt;