Additional changes were needed for the server-live hooks, since those were exiting early for SUBARCH images.

live-build/ubuntu-server/hooks/030-root-squashfs.binary

@@ -15,7 +15,7 @@ case $IMAGE_TARGETS in
 		;;
 esac
 
-if [ -n "$SUBARCH" ]; then
+if [ -n "$SUBARCH" && "$SUBARCH" != "intel-iot" ]; then
 	echo "Skipping rootfs build for subarch flavor build"
 	exit 0
 fi

live-build/ubuntu-server/hooks/032-installer-squashfs.binary

@@ -16,7 +16,7 @@ case $IMAGE_TARGETS in
 		;;
 esac
 
-if [ -n "$SUBARCH" ]; then
+if [ -n "$SUBARCH" && "$SUBARCH" != "intel-iot" ]; then
 	echo "Skipping rootfs build for subarch flavor build"
 	exit 0
 fi

live-build/ubuntu-server/hooks/033-kernel-bits.binary

@@ -14,7 +14,7 @@ case ${IMAGE_TARGETS-} in
 		;;
 esac
 
-if [ -n "${SUBARCH-}" ]; then
+if [ -n "${SUBARCH-}" && "$SUBARCH" != "intel-iot" ]; then
 	echo "Skipping rootfs build for subarch flavor build"
 	exit 0
 fi
@@ -27,7 +27,14 @@ INSTALLER_ROOT=binary/boot/installer.squashfs.dir
 KERNEL_BITS_ROOT=binary/boot/kernel-bits.dir
 KERNEL_BITS_OVERLAY=binary/boot/overlay-kernel-bits
 
+case ${SUBARCH-} in
+	intel-iot)
+		variants='intel'
+		;;
+	*)
 		variants='ga hwe'
+		;;
+esac
 
 for variant in $variants; do
 	if [ "$variant" = "ga" ]; then
@@ -36,6 +43,9 @@ for variant in $variants; do
 	elif [ "$variant" = "hwe" ]; then
 		kernel_metapkg=linux-generic-hwe-$(lsb_release -sr)
 		flavor=generic-hwe
+	elif [ "$variant" = "intel" ]; then
+		kernel_metapkg=linux-intel-iotg-edge
+		flavor=intel-iotg
 	else
 		echo "bogus variant: $variant"
 		exit 1