I solved this issue by installing the original Nvidia drivers and signing it with an individual key.
Because it's complicate, only the steps. * Remove all nvidia packages using "sudo apt purge nvidia*" * Download the driver from nvidia.com * Install the NVIDIA-xxx.run package (choose sign with self created key) * use mokutil --import /usr/share/nvidia/...to import your key * reboot and enrolling your key into the sim (choose "Enroll MOK" on grub boot screen) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-restricted-modules in Ubuntu. https://bugs.launchpad.net/bugs/1921536 Title: "modprobe: ERROR: could not insert 'nvidia': Key was rejected by service" due to binutils mismatch Status in linux package in Ubuntu: Confirmed Status in linux-restricted-modules package in Ubuntu: Confirmed Status in nvidia-graphics-drivers-525 package in Ubuntu: Confirmed Status in nvidia-graphics-drivers-535 package in Ubuntu: Confirmed Bug description: If a user does not have the same version of binutils installed as the one used to produce the nvidia module signature, the module generated at postinst maybe unloadable: modprobe: ERROR: could not insert 'nvidia': Key was rejected by service I ran into this when I tried to install the hirsute kernel/nvidia driver on a focal system. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1921536/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
