Backport hack from jammy for fixing offline installs.

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.664.46) UNRELEASED; urgency=medium
+
+  * Terrible hack workaround for clearing out the non-offline apt cache for
+    desktop related images. Backported from jammy.
+
+ -- Łukasz 'sil2100' Zemczak <lukasz.zemczak@ubuntu.com>  Thu, 16 Mar 2023 14:03:18 +0100
+
 livecd-rootfs (2.664.45) focal; urgency=medium
 
   [ Samir Akarioh ]

live-build/auto/build

@@ -478,6 +478,18 @@ EOF
 		clean_debian_chroot
 	fi
 
+	# XXX: Terrible last-minute hack to work-around issue LP: #2008082 !
+	#  This basically needs to be done better, we simply need to make sure
+	#  that we don't update the cache after lb cleans up. Since identifying
+	#  that might take a moment, for now, for flavors that are generally
+	#  affected by this, we manually clear out the archive-related Packages
+	#  files in the cache.
+	case $PROJECT in
+		ubuntu|xubuntu|kubuntu|ubuntu-budgie|ubuntukylin|ubuntu-mate|ubuntustudio)
+			rm -f chroot/var/lib/apt/lists/*ubuntu.com*_Packages
+			;;
+	esac
+
 	if [ -n "${PASSES}" ]; then
 		PATH="config/:$PATH" lb binary_layered "$@"
 	else