Ok I solved the problem by:
a) using NVIDIA driver metapackage from nvidia-driver-460 (proprietary, tested)
at Software & Updates → Additional Drivers
b) changing desktop from lightdm to gdm3 by
sudo dpkg-reconfigure gdm3
and rebooting
!DISCLAIMER!
I had issues that I couldn’t pass the login screen using gdm3 before, command b) might get you into this kind of trouble. Anyhow for me it works with the listed driver.
Thanks for the feedback.