diff -Nru cloud-init-0.6.3/debian/changelog cloud-init-0.6.3/debian/changelog
--- cloud-init-0.6.3/debian/changelog	2014-04-07 09:18:52.000000000 -0600
+++ cloud-init-0.6.3/debian/changelog	2014-07-03 12:34:10.000000000 -0600
@@ -1,3 +1,13 @@
+cloud-init (0.6.3-0ubuntu1.14) precise; urgency=medium
+
+  * fixed issues where grub-pc does not consider xvda (LP: 1336855).
+    - debian/patches/lp-1336855-grub_xvda.patch: added xvda as a
+      considered device
+    - debian/cloud-init.postinst: check to see if grub-pc is configured
+      for the right device.
+
+ -- Ben Howard <ben.howard@ubuntu.com>  Wed, 02 Jul 2014 13:42:12 -0600
+
 cloud-init (0.6.3-0ubuntu1.13) precise-proposed; urgency=medium
 
   * debian/patches/lp-1302229-fix_futils_azure.patch: fixed imports and
diff -Nru cloud-init-0.6.3/debian/cloud-init.postinst cloud-init-0.6.3/debian/cloud-init.postinst
--- cloud-init-0.6.3/debian/cloud-init.postinst	2014-04-07 08:57:55.000000000 -0600
+++ cloud-init-0.6.3/debian/cloud-init.postinst	2014-07-03 14:11:47.000000000 -0600
@@ -157,6 +157,57 @@
 
    # if there is generic cloud-config preseed, apply them
    handle_preseed_local_cloud_config
+
+   ### Begin fix for LP: 1336855
+   # fix issue where cloud-init misidentifies the location of grub
+   if [ -x /usr/sbin/grub-install ]; then
+
+      # First, identify the root device for the parent.
+      for parm in $(cat /proc/cmdline); do
+           dev=$(echo $parm | awk -F\= '{print$NF}')
+           case $parm in
+               root=UUID*)  [ -d /dev/disk/by-uuid ] &&
+                                root_dev=$(readlink -f /dev/disk/by-uuid/$dev);;
+               root=LABEL*) [ -d /dev/disk/by-label ] &&
+                                root_dev=$(readlink -f /dev/disk/by-label/$dev);;
+               root=/dev*)  [ -d /dev ] &&
+                                root_dev=$(readlink -f $dev);;
+           esac
+           [ -n "$root_dev" ] && break
+      done
+
+      # Only deal with simple, cloud-based devices
+      case $root_dev in
+           /dev/vda*|/dev/xvda*|/dev/sda*) install_grub_safe=1;;
+           *) install_grub_safe=0;;
+      esac
+
+      # Make sure that we are not chrooted. We want to be safe.
+      [ "$(stat -c %d:%i /)" != "$(stat -c %d:%i /proc/1/root/.)" ] &&
+            install_grub_safe=0;
+
+      if [ "$install_grub_safe" -eq 1 ]; then
+         # Find out where grub thinks the root device is
+         db_get grub-pc/install_devices && grub_cfg_dev=${RET} || :
+         db_get grub-pc/install_devices_empty && grub_dev_empty=${RET} || :
+
+         # Find out the parent device for the root device
+         block_path=$(udevadm info -q path -n $root_dev | awk '-Fblock/' '{print$NF}')
+         pdev=$(echo $block_path | awk '-F/' '{print$1}')
+         [ -n "$pdev" ] && parent_dev="/dev/$pdev"
+
+         # If everything checks out, set grub-pc/install_devices and re-install
+         # grub.
+         if [ "$grub_dev_empty" = "false" -a -n "$parent_dev" -a "$parent_dev" != "$grub_cfg_dev" ]; then
+           echo "Reconfiguring grub install device due to mismatch"
+           db_set grub-pc/install_devices "$parent_dev"
+           grub-install $parent_dev ||
+              echo "WARNING! Unable to fix grub device mismatch. You may be broken."
+         fi
+      fi
+   fi
+   ### END fix for LP: 1336855
+
 fi
 
 #DEBHELPER#
diff -Nru cloud-init-0.6.3/debian/patches/lp-1336855-grub_xvda.patch cloud-init-0.6.3/debian/patches/lp-1336855-grub_xvda.patch
--- cloud-init-0.6.3/debian/patches/lp-1336855-grub_xvda.patch	1969-12-31 17:00:00.000000000 -0700
+++ cloud-init-0.6.3/debian/patches/lp-1336855-grub_xvda.patch	2014-07-03 13:41:29.000000000 -0600
@@ -0,0 +1,19 @@
+Description: consider xvda devices for grub-pc configuration
+ Cloud-init previously did not consider /dev/xvda and /dev/xvda1 for
+ setting as the grub device. Subiquently, unattended updates with
+ grub may cause the instance to be unusable.
+Author: Ben Howard <ben.howard@ubuntu.com>
+Bug: https://bugs.launchpad.net/bugs/1336855
+Forwarded: yes
+--- a/cloudinit/CloudConfig/cc_grub_dpkg.py
++++ b/cloudinit/CloudConfig/cc_grub_dpkg.py
+@@ -44,7 +44,8 @@
+             idevs_empty = "false"
+         if idevs == None:
+             idevs = "/dev/sda"
+-            for dev in ("/dev/sda", "/dev/vda", "/dev/sda1", "/dev/vda1"):
++            for dev in ("/dev/sda", "/dev/vda", "/dev/xvda",
++                        "/dev/xvda1", "/dev/sda1", "/dev/vda1"):
+                 if os.path.exists(dev):
+                     idevs = dev
+                     break
diff -Nru cloud-init-0.6.3/debian/patches/series cloud-init-0.6.3/debian/patches/series
--- cloud-init-0.6.3/debian/patches/series	2014-04-07 08:58:13.000000000 -0600
+++ cloud-init-0.6.3/debian/patches/series	2014-07-03 12:34:10.000000000 -0600
@@ -22,3 +22,4 @@
 lp-1269626-azure_new_instance.patch
 lp-1292648-azure-format-ephemeral-new.patch
 lp-1302229-fix_futils_azure.patch
+lp-1336855-grub_xvda.patch