diff -Nru mdadm-3.2.5/debian/changelog mdadm-3.2.5/debian/changelog
--- mdadm-3.2.5/debian/changelog	2015-06-16 12:06:29.000000000 +0200
+++ mdadm-3.2.5/debian/changelog	2016-02-15 19:15:09.000000000 +0100
@@ -1,3 +1,11 @@
+mdadm (3.2.5-5ubuntu4.3) trusty; urgency=low
+
+  * debian/rules: Modify dh_installinit for mdadm-waitidle to get it sorted
+    correctly for running after umountroot and not before even umountfs.
+    (LP: #1551790)
+
+ -- Stefan Bader <stefan.bader@canonical.com>  Mon, 15 Feb 2016 16:22:21 +0100
+
 mdadm (3.2.5-5ubuntu4.2) trusty; urgency=medium
 
   * debian/dmraid2mdadm.cfg: Only append to GRUB_CMDLINE_LINUX_DEFAULT one
diff -Nru mdadm-3.2.5/debian/mdadm.postinst mdadm-3.2.5/debian/mdadm.postinst
--- mdadm-3.2.5/debian/mdadm.postinst	2014-04-30 21:33:40.000000000 +0200
+++ mdadm-3.2.5/debian/mdadm.postinst	2016-02-16 09:18:24.000000000 +0100
@@ -143,6 +143,11 @@
     # Remove old init script
     update-rc.d mdadm-raid remove
 
+    # (Re-)move old mdadm-waitidle links
+    if [ -L /etc/rc0.d/K98mdadm-waitidle ]; then
+        update-rc.d -f mdadm-waitidle remove
+    fi
+
     update-initramfs -u
     if type update-grub2 1>/dev/null 2>/dev/null; then
         update-grub || true
diff -Nru mdadm-3.2.5/debian/rules mdadm-3.2.5/debian/rules
--- mdadm-3.2.5/debian/rules	2014-02-18 09:50:03.000000000 +0100
+++ mdadm-3.2.5/debian/rules	2016-02-15 16:22:15.000000000 +0100
@@ -93,7 +93,11 @@
 	dh_installdocs
 	dh_installexamples debian/mdadd.sh
 	dh_installinit -- defaults 25
-	dh_installinit --init-script=mdadm-waitidle --no-start -- stop 98 0 6 .
+	# Though it is the stop action that should be called, the wait idle
+	# script needs to be installed as "start 70 0 6" to cause it being
+	# sorted _after_ umountfs and umountroot have been called (as the
+	# LSB header does correctly declare). (LP: #xxx)
+	dh_installinit --init-script=mdadm-waitidle --no-start -- start 70 0 6 .
 	dh_installman
 	dh_installcron
 	dh_installchangelogs ChangeLog