Use ubuntu-image from candidate.

debian/changelog

@@ -1,3 +1,11 @@
+livecd-rootfs (24.04.44) UNRELEASED; urgency=medium
+
+  * Switch to using the candidate channel for the ubuntu-image snap. This way
+    we can more easily make use of fixes in ubuntu-image without having to
+    wait for the full validation process to finish.
+
+ -- Łukasz 'sil2100' Zemczak <lukasz.zemczak@ubuntu.com>  Fri, 01 Mar 2024 12:08:13 +0100
+
 livecd-rootfs (24.04.43) noble; urgency=medium
 
   * Set the required debconf settings to allow for noninteractive

live-build/auto/build

@@ -24,7 +24,7 @@ if [ "${IMAGEFORMAT:-}" = "ubuntu-image" ]; then
 	# Use ubuntu-image instead of live-build
 
 	export SNAPPY_STORE_NO_CDN=1
-	LB_UBUNTU_IMAGE_CHANNEL="${LB_UBUNTU_IMAGE_CHANNEL:-stable}"
+	LB_UBUNTU_IMAGE_CHANNEL="${LB_UBUNTU_IMAGE_CHANNEL:-candidate}"
 	snap install \
             --classic --channel="$LB_UBUNTU_IMAGE_CHANNEL" ubuntu-image