KVM disk images should derive from the uefi image.

live-build/ubuntu-cpc/hooks.d/base/kvm-image.binary

@@ -28,7 +28,7 @@ esac
 
 mount_d=$(mktemp -d)
 
-create_derivative "disk" "kvm" #sets ${derivative_img}
+create_derivative uefi kvm #sets ${derivative_img}
 mount_disk_image ${derivative_img} ${mount_d}
 
 # unmount disk image and remove created folders on exit
@@ -46,12 +46,9 @@ trap cleanup_kvm EXIT
 
 divert_grub "${mount_d}"
 replace_kernel ${mount_d} "linux-kvm"
+chroot "${mount_d}" update-grub
 undivert_grub "${mount_d}"
 
-#setup grub correctly
-env DEBIAN_FRONTEND=noninteractive chroot "${mount_d}" update-grub
-replace_grub_root_with_label "${mount_d}"
-
 # Remove initramfs for kvm image
 env DEBIAN_FRONTEND=noninteractive chroot "${mount_d}" apt-get \
     purge -y initramfs-tools busybox-initramfs