make-kpkg abort and complains about missing debian/changelog

Hi, i'm trying to build linux-5.4 as deb package on Ubuntu 20.04.4 LTS. So i followed this guide:

https://wiki.ubuntuusers.de/Archiv/Kernel/Kompilierung/

if i execute "make-kpkg --initrd buildpackage" i'm getting the following error:

make[1]: Leaving directory '/home/alpha/kernel/linux-source-5.4.0'
 dpkg-source -b .
dpkg-source: error: cannot open file linux-source-5.4.0/debian/changelog: No such file or directory
dpkg-buildpackage: error: dpkg-source -b . subprocess returned exit status 255
make: *** [debian/ruleset/targets/common.mk:407: debian/stamp/build/buildpackage] Error 255

I already looked at /usr/share/doc/kernel-package/Problems.gz, but the suggested "make-kpkg clean" doesn't help.

The same steps works with Ubuntu 18.04.6 LTS.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: kernel-package 13.018+nmu2
ProcVersionSignature: Ubuntu 5.4.0-100.113-generic 5.4.166
Uname: Linux 5.4.0-100-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: pass
Date: Thu Mar 3 12:31:28 2022
InstallationDate: Installed on 2022-02-09 (22 days ago)
InstallationMedia: Ubuntu-Server 20.04.3 LTS "Focal Fossa" - Release amd64 (20210824)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kernel-package
UpgradeStatus: No upgrade log present (probably fresh install)