Fix ubuntu-server-live images to generate initrd with casper UUID. Whilst configs are sources, the variables are not exported into the environment by default. Thus when casper hook is executed, it had no idea that it should generate UUID.

debian/changelog

@@ -1,3 +1,12 @@
+livecd-rootfs (2.579) UNRELEASED; urgency=medium
+
+  * Fix ubuntu-server-live images to generate initrd with casper
+    UUID. Whilst configs are sources, the variables are not exported into
+    the environment by default. Thus when casper hook is executed, it had
+    no idea that it should generate UUID.
+
+ -- Dimitri John Ledkov <xnox@ubuntu.com>  Thu, 25 Apr 2019 15:22:22 +0100
+
 livecd-rootfs (2.578) disco; urgency=medium
 
   * Fix the sed script that Tobias had right in the first place and I

live-build/ubuntu-server/hooks/033-kernel-bits.binary

@@ -56,7 +56,7 @@ for variant in $variants; do
 	if [ -n "$LB_INITRAMFS_COMPRESSION" ]; then
 		echo "COMPRESS=$LB_INITRAMFS_COMPRESSION" > "$KERNEL_BITS_ROOT"/etc/initramfs-tools/conf.d/livecd-rootfs.conf
 	fi
-	echo "CASPER_GENERATE_UUID=1" > "$KERNEL_BITS_ROOT"/etc/initramfs-tools/conf.d/casper.conf
+	echo "export CASPER_GENERATE_UUID=1" > "$KERNEL_BITS_ROOT"/etc/initramfs-tools/conf.d/casper.conf
 
 	# Add a hook to record which kernel was booted and mount the
 	# modules.squashfs created below.