livecd-rootfs/live-build/ubuntu-server/hooks/03-kernel-metapkg.chroot_early

#!/bin/bash -ex
# vi: ts=4 noexpandtab

case $PASS in
    ubuntu-server.installer.*)
        flavor=${PASS##*.}
        if [ "$flavor" = "generic" ]; then
            kernel_metapkg=linux-generic
        elif [ "$flavor" = "generic-hwe" ]; then
            kernel_metapkg=linux-generic-hwe-$(lsb_release -sr)
        else
            echo "bogus flavor: $flavor"
            exit 1
        fi
        ;;
    *)
        exit 0
        ;;
esac

cat <<EOF > /etc/initramfs-tools/scripts/init-bottom/live-server
#!/bin/sh
case \$1 in
prereqs) exit 0;;
esac

echo ${kernel_metapkg} > /run/kernel-meta-package
EOF
chmod +x /etc/initramfs-tools/scripts/init-bottom/live-server

cat <<EOF > /etc/initramfs-tools/conf.d/casperize.conf
export CASPER_GENERATE_UUID=1
EOF

cat <<EOF > /etc/initramfs-tools/conf.d/default-layer.conf
LAYERFS_PATH=${PASS}.squashfs
EOF