Get back to using 2 layers, properly handle the install catalogue.

live-build/auto/build

@@ -171,6 +171,10 @@ if [ "$PROJECT" = "ubuntu-core-desktop" ]; then
 	mv output/*.img pc.img
 	xz -0 -T4 pc.img
 	rm -rf output/
+
+	# Prepare the source catalogue
+	cat install-sources-in.yaml | sed "s/@SIZE@/$(stat -c%s pc.img.xz)/g" > ../"$PREFIX".install-sources.yaml
+
 	# We need to rename the image file so that it can be pulled
 	# by the builder.
 	mv pc.img.xz ../"$PREFIX".img.xz

live-build/auto/config

@@ -814,29 +814,12 @@ case $PROJECT in
 		touch config/universe-enabled
 		KERNEL_FLAVOURS='generic-hwe-22.04'
 		PASSES_TO_LAYERS="true"
-		# the live layer, contains all packages for the live session installer
-		add_task live minimal
-		add_snap live ubuntu-core-desktop-installer/classic core22 snapd
-		add_package live linux-$KERNEL_FLAVOURS plymouth-theme-spinner squashfs-tools snapd cloud-init
-
-		# now let's create the neccessary catalog files
-		cat <<-EOF > config/live.catalog-in.yaml
-		- default: true
-		  description:
-		    en: Ubuntu Core Desktop.
-		  id: ubuntu-core-desktop
-		  locale_support: none
-		  name:
-		    en: Ubuntu Core Desktop
-		  path: pc.img.xz
-		  type: dd-xz:file
-		  size: @SIZE@
-		  variant: core 
-		EOF
 
-		# we have to manually mark the live layer as the LIVE_PASS, since it's also
-		# the only layer we build
-		LIVE_PASS=live
+		# the minimal layer, for minimal installs
+		add_task minimal minimal
+		# the live layer, contains all packages for the live session installer
+		add_snap minimal.live ubuntu-core-desktop-installer/classic core22 snapd
+		add_package minimal.live linux-$KERNEL_FLAVOURS plymouth-theme-spinner squashfs-tools snapd cloud-init
 		;;
 
 	ubuntu-oem)