diff -Nru initramfs-tools-0.122ubuntu8.2/debian/changelog initramfs-tools-0.122ubuntu8.3/debian/changelog
--- initramfs-tools-0.122ubuntu8.2/debian/changelog	2016-09-23 22:01:48.000000000 +0000
+++ initramfs-tools-0.122ubuntu8.3/debian/changelog	2016-09-27 20:27:38.000000000 +0000
@@ -1,3 +1,13 @@
+initramfs-tools (0.122ubuntu8.3) xenial; urgency=medium
+
+  * scripts/functions: make sure we can try to start all available and suitable
+    interfaces if ip= isn't set when setting up the network, and exit as soon
+    as we get an IP address. This retains the old behavior from ipconfig when
+    ip= is unset, for really simple remote-root scenarios. (LP: #1628306)
+  * scripts/functions: retain bootp/rarp behavior using ipconfig.
+
+ -- Mathieu Trudel-Lapierre <cyphermox@ubuntu.com>  Tue, 27 Sep 2016 16:27:38 -0400
+
 initramfs-tools (0.122ubuntu8.2) xenial; urgency=medium
 
   [ Mathieu Trudel-Lapierre ]
diff -Nru initramfs-tools-0.122ubuntu8.2/scripts/functions initramfs-tools-0.122ubuntu8.3/scripts/functions
--- initramfs-tools-0.122ubuntu8.2/scripts/functions	2016-09-23 22:01:48.000000000 +0000
+++ initramfs-tools-0.122ubuntu8.3/scripts/functions	2016-09-27 20:25:48.000000000 +0000
@@ -194,6 +194,34 @@
 	return ${RET}
 }
 
+all_netbootable_devices()
+{
+	for device in /sys/class/net/* ; do
+		if [ ! -e $device/flags ]; then
+			continue
+		fi
+
+		loop=$(($(cat $device/flags) & 0x8 && 1 || 0))
+		bc=$(($(cat $device/flags) & 0x2 && 1 || 0))
+		ptp=$(($(cat $device/flags) & 0x10 && 1 || 0))
+
+		# Skip any device that is a loopback
+		if [ $loop = 1 ]; then
+			continue
+		fi
+
+		# Skip any device that isn't a broadcast
+		# or point-to-point.
+		if [ $bc = 0 ] && [ $ptp = 0 ]; then
+			continue
+		fi
+
+		DEVICE="$DEVICE $(basename $device)"
+	done
+
+	echo $DEVICE
+}
+
 configure_networking()
 {
 	if [ -n "${BOOTIF}" ]; then
@@ -254,16 +282,38 @@
 		none|off)
 			# Do nothing
 			;;
-		""|::::*|on|any|dhcp|bootp|rarp|both)
+		""|::::*|on|any|dhcp)
 			# if IP contains something other than BOOTIF; use that
 			# interface to bring up the network.
 			if ! echo "${IP}" | grep -qc 'BOOTIF'; then
 				DEVICE="${IP#*:*:*:*:*:*}";
 			fi
 
+			# if we don't have a device specified, try to bring up
+			# any eligible device.
+			if [ -z "${DEVICE}" ]; then
+				DEVICE=$(all_netbootable_devices)
+			fi
+
 			# Bring up device
-			dhclient -4 -1 -v "${DEVICE}"
-			dhclient -6 -1 -v "${DEVICE}"
+			for dev in "${DEVICE}"; do
+				dhclient -4 -1 -v "${dev}"
+				dhclient -6 -1 -v "${dev}"
+
+				# If we reach BOUND or BOUND6, break out -- we
+				# got an interface configured.
+				if grep -qc BOUND /run/net-${dev}.conf; then
+					break
+				fi
+			done
+
+			# At this point we should have configured an interface
+			# properly, or none were suitable. Keep track of the
+			# last device we reached to source the results later.
+			DEVICE=$dev
+			;;
+		bootp|rarp|both)
+			ipconfig -t ${ROUNDTTT} -c ${IP} -d "${DEVICE}"
 			;;
 		*)
 			ipconfig -t ${ROUNDTTT} -d $IP