diff --git a/debian/changelog b/debian/changelog
index c439a56a..e2f2b9d5 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,19 @@
+livecd-rootfs (2.442) artful; urgency=medium
+
+  [ Robert Jennings ]
+  * live-build/ubuntu-cpc/hooks/060-ipv6.chroot: remove faulty release
+    comparison prior to aa-series (LP: #1681548)
+  * live-build/ubuntu-cpc/hooks/999-extras.binary: Exit on first failure
+
+  [ Balint Reczey ]
+  * sync before calling kpartx to let writing to loop devices finish
+  * Sort and list dependencies nicely
+  * Require PROJECT environment to be set for lb build
+  * Allow overwriting IMAGEFORMAT even for ubuntu-cpc and ubuntu-server
+  * Optionally use ubuntu-image for building snap based images
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Fri, 28 Apr 2017 15:15:12 -0700
+
 livecd-rootfs (2.441.2) zesty; urgency=medium
 
   * The ubuntu-server:live should use a casper-based initramfs to work
diff --git a/debian/control b/debian/control
index 52e4d3b2..9ecc7dbe 100644
--- a/debian/control
+++ b/debian/control
@@ -8,7 +8,25 @@ Vcs-Bzr: http://bazaar.launchpad.net/~ubuntu-core-dev/livecd-rootfs/trunk
 
 Package: livecd-rootfs
 Architecture: any
-Depends: ${misc:Depends}, debootstrap, rsync, python-minimal | python, procps, squashfs-tools (>= 1:3.3-1), grep-dctrl, lsb-release, lzma, e2fsprogs, germinate (>= 1.25.1), apt-utils, gnupg, live-build (>= 3.0~a57-1ubuntu12~), android-tools-fsutils [armhf], python3-software-properties
+Depends: ${misc:Depends},
+         android-tools-fsutils [armhf],
+         apt-utils,
+         debootstrap,
+         e2fsprogs,
+         germinate (>= 1.25.1),
+         gnupg,
+         grep-dctrl,
+         live-build (>= 3.0~a57-1ubuntu12~),
+         lsb-release,
+         lzma,
+         procps,
+         python-minimal | python,
+         python3-software-properties,
+         rsync,
+         snapd,
+         squashfs-tools (>= 1:3.3-1),
+         sudo,
+         ubuntu-image
 Suggests: partimage
 Breaks: ubuntu-defaults-builder (<< 0.32)
 Description: construction script for the livecd rootfs
diff --git a/live-build/auto/build b/live-build/auto/build
index 103b5005..cfe00bdd 100755
--- a/live-build/auto/build
+++ b/live-build/auto/build
@@ -10,6 +10,17 @@ Arguments "${@}"
 Read_conffiles config/all config/common config/bootstrap config/chroot config/binary config/source
 Set_defaults
 
+if [ -z "${PROJECT:-}" ]; then
+    echo "PROJECT environment variable has to be set" >&2
+    exit 1
+fi
+
+if [ "${IMAGEFORMAT:-}" = "ubuntu-image" ]; then
+	# Use ubuntu-image instead of live-build
+	env SNAPPY_STORE_NO_CDN=1 ubuntu-image -o livecd."$PROJECT".img livecd."$PROJECT".model-assertion
+	exit 0
+fi
+
 # Setup cleanup function
 Setup_cleanup
 
diff --git a/live-build/auto/config b/live-build/auto/config
index 2d2ade92..34937680 100755
--- a/live-build/auto/config
+++ b/live-build/auto/config
@@ -104,14 +104,16 @@ add_binary_hook ()
 	BINARY_HOOKS="${BINARY_HOOKS:+$BINARY_HOOKS }$1"
 }
 
-case $PROJECT:$SUBPROJECT in
-	ubuntu-cpc:*)
-		IMAGEFORMAT=ext4
-		;;
-	ubuntu-server:live)
-		IMAGEFORMAT=plain
-		;;
-esac
+if [ -z "${IMAGEFORMAT:-}" ]; then
+	case $PROJECT:$SUBPROJECT in
+		ubuntu-cpc:*)
+			IMAGEFORMAT=ext4
+			;;
+		ubuntu-server:live)
+			IMAGEFORMAT=plain
+			;;
+	esac
+fi
 
 case $IMAGEFORMAT in
 	ext2|ext3|ext4)
@@ -148,6 +150,35 @@ case $IMAGEFORMAT in
 		OPTS="${OPTS:+$OPTS }--initramfs $INITRAMFS_TYPE --chroot-filesystem $IMAGEFORMAT"
 		;;
 
+	ubuntu-image)
+		case "$ARCH+${SUBARCH:-}" in
+			amd64+*)
+				MODEL=pc-amd64 ;;
+			i386+*)
+				MODEL=pc-i386 ;;
+			arm64+snapdragon)
+				MODEL=dragonboard ;;
+			armhf+raspi2)
+				MODEL=pi2 ;;
+			armhf+raspi3)
+				MODEL=pi3 ;;
+			*)
+				echo "Model $ARCH+${SUBARCH:-} unknown to livecd-rootfs" >&2
+				exit 1
+				;;
+		esac
+		echo "IMAGEFORMAT=$IMAGEFORMAT" >> config/common
+		# Store model assertion in top dir to get it picked up later as a build artifact
+		env SNAPPY_STORE_NO_CDN=1 snap known --remote model series=16 model="$MODEL" brand-id=canonical > livecd."$PROJECT".model-assertion
+		echo "Configured ubuntu-image for the following model assertion:"
+		cat livecd."$PROJECT".model-assertion
+		echo "----------------------------------------------------------"
+		# Fake finished configuration for lb build
+		mkdir -p .build
+		touch .build/config
+		exit 0
+		;;
+
 	*)
 		case $PROJECT in
 			ubuntu-server|ubuntu-touch|ubuntu-touch-custom)
diff --git a/live-build/functions b/live-build/functions
index 5abdeea1..313a559b 100644
--- a/live-build/functions
+++ b/live-build/functions
@@ -13,6 +13,8 @@ apt-get -qqy install dosfstools gdisk
 clean_loops() {
 
     if [ -n "${backing_img}" ]; then
+        # sync before removing loop to avoid "Device or resource busy" errors
+        sync
         kpartx -v -d "${backing_img}"
         unset backing_img
     fi
diff --git a/live-build/ubuntu-cpc/hooks/060-ipv6.chroot b/live-build/ubuntu-cpc/hooks/060-ipv6.chroot
index 3d4a0be2..532b8473 100755
--- a/live-build/ubuntu-cpc/hooks/060-ipv6.chroot
+++ b/live-build/ubuntu-cpc/hooks/060-ipv6.chroot
@@ -1,15 +1,8 @@
 #!/bin/bash
 #
-# Disable IPv6 privacy extensions on Utopic and later
+# Disable IPv6 privacy extensions
 #
 
-codename=$(sh -c 'lsb_release --short --codename')
-dist_ge() { [[ "$1" > "$2" || "$1" == "$2" ]]; }
-
-if ! dist_ge "${codename}" "trusty"; then
-    exit 0
-fi
-
 cat << EOF > /etc/sysctl.d/99-cloudimg-ipv6.conf
 # Written by the Cloud Image build process
 # See https://bugs.launchpad.net/ubuntu/+source/procps/+bug/1068756
diff --git a/live-build/ubuntu-cpc/hooks/999-extras.binary b/live-build/ubuntu-cpc/hooks/999-extras.binary
index 39c464de..0d506ea4 100755
--- a/live-build/ubuntu-cpc/hooks/999-extras.binary
+++ b/live-build/ubuntu-cpc/hooks/999-extras.binary
@@ -13,4 +13,4 @@ export CLOUD_IMG_STR="$IMAGE_STR"
 export FS_LABEL="cloudimg-rootfs"
 
 # Cleaner execution
-/bin/run-parts --regex ".*\.binary" "${extra_d}"
+/bin/run-parts --exit-on-error --regex ".*\.binary" "${extra_d}"