Does it even make sense or is worth the possible effort? Nvidia technical explanation here would be helpful because I have not found such clear info online that uefi boot mode is needed for nvidia drivers to work.
I have not installed nvidia drivers using nvidia runfile installers.One installation walkthrough also attached.
I have also tried to install the recent production driver 530 but the result is the same - booted once but then no comm with the driver, and after that other attempts end up not booting. I have also noticed that the driver 525 sometimes boots but does not communicate with the driver (nvidia-smi output says no device found). But nvidia drivers are vital for this system. The only way to recover from not booting is to boot to the previous kernel from the grub menu (for example to 5.15.0.69… instead of 5.15.0.70…) where the nvidia drivers were not installed, then fully remove the nvidia drivers (sudo apt remove -purge …), and then reboot, resulting in using Ubuntu nuoveau drivers again. Ubuntu hangs on boot and does not finish. I also tried different grub edit options with nomodeset and some others, no success. I have tried to boot also to recovery mode, no success. I have used different command line installation methods (apt, ubuntu-drivers, then this manual here - NvidiaDriversInstallation - Community Help Wiki), each time fully uninstalling the previous drivers before trying again from scratch. I have tried installing drivers 525, 515, 510, 470, 460 (ends up installing seemingly 470) and none of them boot. Ubuntu 20.04.6 fresh install, kernel version 5.15 - this is the OS where the problem occurs. Ubuntu 18.04 has nvidia driver 460 installed and is booting - this is not the problem in this case. Dual boot (both legacy) with Ubuntu 18.04 on one SSD and Ubuntu 20.04 on another SSD.
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