---
layout: post
title: "nVidia kernel module: key rejected"
date: 2025-08-02 16:00:00 +0200
comments: true
categories:
---

# Situation

On a Dell Precision 7520 running Debian, I found myself switching between UEFI / secure boot and legacy BIOS boot, and having trouble restoring the right boot settings after reenabling secure boot.

The first problem was to identify the correct file to boot from: `EFI/debian/shimx64.efi`.

# Kernel module load issue

After disabling secure boot and then reenabling it again, kernel modules not loading despite updating nvidia-driver and kernel-image

solution: reenroll MOK (Machine Owner Key):
* `mokutil --import /var/lib/dkms/mok.pub` (set an import password)
* `mokutil --list-new`
* reboot into MOK management => provide import password => key reenrolled
* modules loding :thumsbup:

Debian documentation: [Secure Boot](https://wiki.debian.org/fr/SecureBoot)