rtl88x2BU won't build in 20.10

I have a USB wifi adapter, I installed rtl88x2BU and for every kernel update in 20.04 dkms built it automatically without any problems.

Now I have updated to 20.10 I would expect this to happen but the build fails:

Building module:
cleaning build area...
make -j4 KERNELRELEASE=5.8.0-26-generic KVER=5.8.0-26-generic src=/usr/src/rtl88x2bu-5.3.1.......(bad exit status: 2)
ERROR (dkms apport): binary package for rtl88x2bu: 5.3.1 not found
Error! Bad return status for module build on kernel: 5.8.0-26-generic (x86_64)
Consult /var/lib/dkms/rtl88x2bu/5.3.1/build/make.log for more information.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: dkms 2.8.3-4
ProcVersionSignature: Ubuntu 5.8.0-26.27-generic 5.8.14
Uname: Linux 5.8.0-26-generic x86_64
ApportVersion: 2.20.11-0ubuntu50
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Oct 28 11:43:38 2020
InstallationDate: Installed on 2015-06-21 (1955 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
PackageArchitecture: all
SourcePackage: dkms
UpgradeStatus: Upgraded to groovy on 2020-10-23 (4 days ago)