Public bug reported:
After installing nvidia-driver-595-open on Kubuntu 26.04 with Secure
Boot enabled, the NVIDIA kernel module was successfully built by DKMS
and signed, but Secure Boot rejected the module with:
modprobe: ERROR: could not insert 'nvidia': Key was rejected by service
The system booted using only the Intel GPU and nvidia-smi failed.
The issue was resolved only after manually enrolling the MOK key using:
sudo update-secureboot-policy --enroll-key
and completing the MOK enrollment during reboot.
The installation process should provide clearer guidance or
automatically verify MOK enrollment status.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: nvidia-driver-595-open 595.71.05-0ubuntu0.26.04.1
ProcVersionSignature: Ubuntu 7.0.0-22.22-generic 7.0.0
Uname: Linux 7.0.0-22-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Wed Jun 10 14:10:36 2026
InstallationDate: Installed on 2026-05-24 (17 days ago)
InstallationMedia: Kubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423)
SourcePackage: nvidia-graphics-drivers-595
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: nvidia-graphics-drivers-595 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2156396
Title:
nvidia-driver-595-open on Kubuntu 26.04 with Secure Boot
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