NVIDIA driver stops working on reboot Ubuntu 23.04 lunar

The issue at hand

I have laptop with AMD CPU and Nvidia GPU, and use Ubuntu. This configuration has given me a lot of trouble, because AMD support for Linux is apparently not working very well. But a new issue has popped up recently, and these are the steps:

1. PC is working fine, Nvidia driver is installed and running, and I can use the GPU for development.
2. I reboot the PC
3. The Nvidia now no longer works

This is where I am now. When I run nvidia-smi I get this message:

NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.

But when I open the panel "Additional Drivers" inside "Software & Updates", then I get shown this as active Driver:

o Using NVIDIA driver metapackage from nvidia-driver-535 (proprietary, tested)

I can also run lspci | grep VGA for this output:

01:00.0 VGA compatible controller: NVIDIA Corporation GA104 [Geforce RTX 3070 Ti Laptop GPU] (rev a1)
09:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Rembrandt [Radeon 680M] (rev c7)

Finally, I can run sudo apt search nvidia-driver-535 for this output:

...
nvidia-driver-535/lunar-updates,lunar-security,lunar,now 535.54.03-0ubuntu0.23.04.2 amd64 [installed]
  NVIDIA driver metapackage
...
xserver-xorg-video-nvidia-535/lunar-updates,lunar-security,lunar,now 535.54.03-0ubuntu0.23.04.2 amd64 [installed,automatic]
  NVIDIA binary Xorg driver
...

And yes, I just deleted (ie. sudo apt purge nvidia*) the driver from the PC and reinstalled it. Same problem still. And I have also forced gdm3 to use X11 by editing the file /etc/gdm3/custom.conf. Because it doesn't work with Wayland.

Attempt at debugging

My skills at debugging the internals of Linux are quite limited, but I did get a few messages from running sudo journalctl -S -1h:

modprobe: FATAL: Module nvidia not found in directory /lib/modules/6.2.0-25-generic
[...]
systemd[1860]: Started app-gnome-nvidia\x2dsettings-7946.scope - Application launched by gnome-shell.
nvidia-settings.desktop[7946]: ERROR: NVIDIA driver is not loaded
nvidia-settings[7946]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
nvidia-settings[7946]: ctk_powermode_new: assertion '(ctrl_target != NULL) && (ctrl_target->h != NULL)' failed
nvidia-settings.desktop[7946]: ERROR: nvidia-settings could not find the registry key file or the X server is not accessible. This file should have been installed along with this driver at /usr/share/nvidia/nvidia-application-profiles-key-documentation. The application profiles will continue to work, but values cannot be prepopulated or validated, and will not be listed in the help text. Please see the README for possible values and descriptions.
nvidia-settings[7946]: PRIME: No offloading required. Abort
nvidia-settings[7946]: PRIME: is it supported? no

Conclusion

The PC can read the GPU. The NVIDIA driver is correctly installed. But somehow, randomly, on reboot the driver gets disabled. Or something.

What is happening? I have absolutely no idea how to fix this.

Temporary solution suggestion

After a quick reboot it seems to be working now - but I will leave the question open in case someone else has the same problem, or it somehow appears again. The "fix" was to open the BIOS upon startup, and disable Secure Boot. No idea why - saw it suggested somewhere - and now nvidia-smi runs as it should.

Same problem happened to me 2 days ago after updating the kernel. I fixed it by disabling the secure boot.

This is unusual though because before the update I was able to run the drivers properly even with the secure boot on.

sudo apt-get install nvidia-dkms-535 

This worked for me

For some strange reason, I had to:

sudo apt-get install nvidia-dkms-535 

I thought this was installed previously as a dependency for nvidia-driver-535...because it did work before I did an apt-get upgrade and rebooted.

Anyway, the driver now shows up in my /lib/modules/ folder for all installed kernel versions.

Mine updated the kernel to 6.2.0.25 from 24. It booted but no desktop. Not the first time with 23.04. I launched tty and shutdown. Upon reboot launched the grub menu and went back to 6.2.0.24. Then modified grub to only boot off of my selection and not an update. My test machine runs with secure boot off. I've got 10 ssd's that I can switch to test different distributions. The motherboard is an Asus Z77. Debian, Ubuntu 23.04, 22.04, Linux Mint, Manjaro, will not run with secure boot on.