Boot with an initramfs by default in cloud images

Generic cloud images with the linux-generic kernel are not able to
boot without an initramfs. Previously, these images attempted to boot
without an initramfs, would fail, and then retry with an initramfs.
This slows the boot and is confusing behavior.

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

@@ -73,14 +73,6 @@ install_grub() {
     efi_boot_dir="/boot/efi/EFI/BOOT"
     chroot mountpoint mkdir -p "${efi_boot_dir}"
 
-    if [ -n "$partuuid" ]; then
-        # FIXME: code duplicated between disk-image.binary
-        # and disk-image-uefi.binary.  We want to fix this to not
-        # have initramfs-tools installed at all on these images.
-        echo "partuuid found for root device; omitting initrd"
-        echo "GRUB_FORCE_PARTUUID=$partuuid" >> mountpoint/etc/default/grub.d/40-force-partuuid.cfg
-    fi
-
     chroot mountpoint apt-get -y update
 
     # UEFI GRUB modules are meant to be used equally by Secure Boot and
@@ -154,8 +146,6 @@ create_empty_disk_image "${disk_image}"
 create_partitions "${disk_image}"
 mount_image "${disk_image}" 1
 
-partuuid=$(blkid -s PARTUUID -o value "$rootfs_dev_mapper")
-
 # Copy the chroot in to the disk
 make_ext4_partition "${rootfs_dev_mapper}"
 mkdir mountpoint

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

@@ -73,8 +73,6 @@ create_empty_partition "${disk_image}" "$ROOTPART" "$ROOTPART_START" -1 ext2 "$R
 
 mount_image "${disk_image}" "$ROOTPART"
 
-partuuid=$(blkid -s PARTUUID -o value "$rootfs_dev_mapper")
-
 # Copy the chroot in to the disk
 make_ext4_partition "${rootfs_dev_mapper}"
 mkdir mountpoint
@@ -122,15 +120,6 @@ if [ "${should_install_grub}" -eq 1 ]; then
         ${loop_device}
 
     rm mountpoint/tmp/device.map
-
-	if [ -n "$partuuid" ]; then
-		echo "partuuid found for root device; forcing it in Grub"
-		mkdir -p mountpoint/etc/default/grub.d
-		echo "GRUB_FORCE_PARTUUID=$partuuid" >> mountpoint/etc/default/grub.d/40-force-partuuid.cfg
-		divert_grub mountpoint
-		chroot mountpoint update-grub
-		undivert_grub mountpoint
-	fi
 fi
 
 if [ "$ARCH" = "s390x" ]; then