I forced my system (20.04) with the latest kernel available.
With the latest kernel from apt-get dist-upgrade (5.4) still had problems, then used this
script to get kerlnel 5.8 and now works fine.
Only side problem is that my vmware and virtualbox stopped to work because no drivers available for this kernel. Great oppurtunity to learn 'virt-manager' qemu kvm stuff ...