diff -Nru gnome-session-3.9.90/debian/changelog gnome-session-3.9.90/debian/changelog
--- gnome-session-3.9.90/debian/changelog	2014-02-20 08:07:11.000000000 +0000
+++ gnome-session-3.9.90/debian/changelog	2014-03-14 00:43:16.000000000 +0000
@@ -1,3 +1,11 @@
+gnome-session (3.9.90-0ubuntu12) trusty; urgency=medium
+
+  * gnome-session-bin.user-session.upstart: Use XDG_CURRENT_DESKTOP
+    as the instance specifier for gnome-session upstart jobs, since 
+    other sessions apart from ubuntu will need to use u-s-d (LP: #1224217)
+
+ -- Tim Lunn <tim@feathertop.org>  Wed, 12 Mar 2014 16:27:59 +1100
+
 gnome-session (3.9.90-0ubuntu11) trusty; urgency=medium
 
   * debian/50-ubuntu.conf:
diff -Nru gnome-session-3.9.90/debian/gnome-session-bin.user-session.upstart gnome-session-3.9.90/debian/gnome-session-bin.user-session.upstart
--- gnome-session-3.9.90/debian/gnome-session-bin.user-session.upstart	2014-02-20 08:07:11.000000000 +0000
+++ gnome-session-3.9.90/debian/gnome-session-bin.user-session.upstart	2014-03-14 00:43:16.000000000 +0000
@@ -2,12 +2,12 @@
 author "Stéphane Graber <stgraber@ubuntu.com>"
 
 start on started dbus and xsession SESSIONTYPE=gnome-session
-stop on starting gnome-session INSTANCE!=$DESKTOP_SESSION
+stop on starting gnome-session INSTANCE!=$XDG_CURRENT_DESKTOP
 
 env GNOME_DESKTOP_SESSION_ID=this-is-deprecated
 export GNOME_DESKTOP_SESSION_ID
 
-instance $DESKTOP_SESSION
+instance $XDG_CURRENT_DESKTOP
 
 emits desktop-start
 emits desktop-end