diff -Nru grub-installer-1.78ubuntu14/debian/changelog grub-installer-1.78ubuntu15/debian/changelog
--- grub-installer-1.78ubuntu14/debian/changelog	2014-01-31 09:16:36.000000000 -0600
+++ grub-installer-1.78ubuntu15/debian/changelog	2014-02-07 10:58:06.000000000 -0600
@@ -1,3 +1,10 @@
+grub-installer (1.78ubuntu15) trusty; urgency=low
+
+  * Force grub-installer/bootdev to take precedence over only_debian and
+    with_other_os. (LP: #1012629)
+
+ -- Dave Chiluk <chiluk@canonical.com>  Fri, 07 Feb 2014 10:57:41 -0600
+
 grub-installer (1.78ubuntu14) trusty; urgency=medium
 
   * Only look for the prep flag, not boot as well; these appear to be
diff -Nru grub-installer-1.78ubuntu14/grub-installer grub-installer-1.78ubuntu15/grub-installer
--- grub-installer-1.78ubuntu14/grub-installer	2014-01-31 08:22:11.000000000 -0600
+++ grub-installer-1.78ubuntu15/grub-installer	2014-02-07 10:58:32.000000000 -0600
@@ -751,7 +751,11 @@
 db_progress INFO grub-installer/progress/step_bootdev
 
 while : ; do
-	if [ "$state" = 1 ]; then
+	db_fget grub-installer/bootdev seen
+	if [ "$RET" = true ] && db_get grub-installer/bootdev && [ "$RET" ] ; then
+		bootdev=$RET
+		break
+	elif [ "$state" = 1 ]; then
 		if [ "$frdev" ]; then
 			# If /boot is on SATA RAID/multipath, then there's
 			# only one possible answer; we don't support device