nvidia driver not loaded after install

["Anil F Duggirala" <anilduggirala@fastmail.fm>]

I am trying to install the Nvidia driver on my Dell XPS 9550 fresh Debian 12 machine.

I followed all instructions in https://wiki.debian.org/NvidiaGraphicsDrivers#Debian_12_.22Bookworm.22

including:
apt install linux-headers-amd64

Including the extra instructions given here: https://lists.debian.org/debian-user/2025/01/msg00121.html
To enroll the MOK key.

Then added the additional source to apt list and did:
apt install nvidia-driver firmware-misc-nonfree

After rebooting the nvidia driver is not loaded and some errors are presented by dmesg:

$ sudo dmesg | grep modul
[    4.313816] systemd[1]: Inserted module 'autofs4'
[    4.586851] systemd[1]: Starting systemd-modules-load.service - Load Kernel Modules...
[    4.590723] loop: module loaded
[    5.621417] Loading of module with unavailable key is rejected
[    5.646333] Loading of module with unavailable key is rejected
...
[    6.828071] systemd[1]: systemd-modules-load.service: Main process exited, code=exited, status=1/FAILURE
[    6.828216] systemd[1]: systemd-modules-load.service: Failed with result 'exit-code'.
[    6.828417] systemd[1]: Failed to start systemd-modules-load.service - Load Kernel Modules.
[    6.828886] systemd[1]: systemd-modules-load.service: Consumed 2.190s CPU time.
[   16.905450] Loading of module with unavailable key is rejected
...

$ sudo modprobe nvidia
modprobe: ERROR: could not insert 'nvidia_current': Key was rejected by service
modprobe: ERROR: ../libkmod/libkmod-module.c:1047 command_do() Error running install command 'modprobe -i nvidia-current ' for module nvidia: retcode 1
modprobe: ERROR: could not insert 'nvidia': Invalid argument

Can anyone please help me out. Getting Debian to work in this laptop has been a big challenge.

thank you,


Anil F