Imported 2.664.3

No reason for CPC update specified.

debian/changelog

@@ -1,3 +1,19 @@
+livecd-rootfs (2.664.3) focal; urgency=medium
+
+  [ Łukasz 'sil2100' Zemczak ]
+  * Enable overrides of UC20 grade dangerous channels - as this is possible.
+    (LP: #1879350)
+
+  [ Iain Lane ]
+  * Hack seeding of linux kernel in ubuntustudio/focal
+    ubuntustudio-default-settings in focal release has a Recommends to this
+    kernel, which makes it impossible to update the kernel later on, since we
+    would install the -updates and release kernel, which isn't allowed and
+    causes FTBFS. Hack out the focal-release kernel and let the rest of the
+    build process pull in the right one. (LP: #1884915)
+
+ -- Iain Lane <iain.lane@canonical.com>  Tue, 21 Jul 2020 16:25:18 +0100
+
 livecd-rootfs (2.664.2) focal; urgency=medium
 
   * Revert of initramfs package removal in KVM image (LP: #1880170)

live-build/auto/config

@@ -396,6 +396,15 @@ case $IMAGEFORMAT in
 						candidate|beta|edge|dangerous)
 							MODEL="ubuntu-core-20-${MODEL#pc-}-${CHANNEL}"
 							;;
+						dangerous-*)
+							# That being said, the dangerous grade *does*
+							# support channel overrides, so we can use the
+							# dangerous model assertion and override the channel
+							# freely.
+							MODEL="ubuntu-core-20-${MODEL#pc-}-dangerous"
+							CHANNEL=${CHANNEL#dangerous-}
+							UBUNTU_IMAGE_ARGS="$UBUNTU_IMAGE_ARGS -c $CHANNEL"
+							;;
 						*)
 							echo "Unknown CHANNEL ${CHANNEL} specification for ${SUITE}"
 							exit 1
@@ -679,6 +688,23 @@ case $PROJECT in
 
 	ubuntustudio-dvd)
 		add_task install minimal standard ubuntustudio-desktop ubuntustudio-audio ubuntustudio-fonts ubuntustudio-graphics ubuntustudio-video ubuntustudio-publishing ubuntustudio-photography
+		case $SUITE in
+			focal)
+				# ubuntustudio-default-settings in focal
+				# release has a Recommends to this kernel,
+				# which makes it impossible to update the
+				# kernel later on, since we would install the
+				# -updates and release kernel, which isn't
+				# allowed and causes the squashfs to fail to
+				# build.  Hack out the focal-release kernel and
+				# let the rest of the build process pull in the
+				# right one. (See right below.)
+				for package in linux-lowlatency linux-image-lowlatency linux-headers-lowlatency linux-image-5.4.0-26-lowlatency linux-headers-5.4.0-26-lowlatency; do
+					sed -i "s/$/ -a --not -XFPackage ${package}/" \
+						"config/package-lists/livecd-rootfs.list.chroot_install"
+				done
+				;;
+		esac
 		COMPONENTS='main restricted universe multiverse'
 		case $ARCH in
 			amd64|i386)	KERNEL_FLAVOURS=lowlatency ;;