diff --git a/live-build/functions b/live-build/functions
index 2bdbb623..ade899f0 100644
--- a/live-build/functions
+++ b/live-build/functions
@@ -890,4 +890,6 @@ replace_kernel () {
         update --assume-yes
     env DEBIAN_FRONTEND=noninteractive chroot "${mountpoint}" apt-get \
         install --assume-yes "${new_kernel}" 
+    env DEBIAN_FRONTEND=noninteractive chroot "${mountpoint}" apt-get \
+        autoremove --purge --assume-yes
 }
\ No newline at end of file
diff --git a/live-build/ubuntu-cpc/hooks.d/base/kvm-image.binary b/live-build/ubuntu-cpc/hooks.d/base/kvm-image.binary
index 716d148a..cb98a2b1 100644
--- a/live-build/ubuntu-cpc/hooks.d/base/kvm-image.binary
+++ b/live-build/ubuntu-cpc/hooks.d/base/kvm-image.binary
@@ -5,7 +5,7 @@
 #
 
 echo "Building KVM image"
-
+IMAGE_STR="# CLOUD_IMG: This file was created/modified by the Cloud Image build process"
 case ${SUBPROJECT:-} in
     minimized)
         echo "Skipping minimized $0 builds"
@@ -61,4 +61,4 @@ env DEBIAN_FRONTEND=noninteractive chroot "${mount_d}" apt-get \
     clean
 
 create_manifest ${mount_d} livecd.ubuntu-cpc.disk-kvm.manifest
-convert_to_qcow2 binary/boot/disk-kvm.ext4 livecd.ubuntu-cpc.disk-kvm.img 
\ No newline at end of file
+convert_to_qcow2 ${derivative_img} livecd.ubuntu-cpc.disk-kvm.img 
\ No newline at end of file