NVIDIA-SMI has failed... Tesla P40 v.550.127.08 on VM-Ubuntu server 24.04

Hi
First off - i am quite a new Linux user, so please be gentle ;-)

I ran into a problem, after installing a new Ubuntu server 24.04.1 LTS (on a proxmox vm) and installing the proprietary 550.127.08 driver on my Lenovo Server ST550, the " NVIDIA-SMI has failed because it couldn’t communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running"
the card i recognized and the driver is also - but still no luck…

I have tried reinstalling the driver, disabling SecureBoot, rebuilding the kernel module

   sudo dkms remove nvidia/550.127.08 --all
   sudo dkms install nvidia/550.127.08

and the system returns this :

lspci | grep -i nvidia
06:10.0 3D controller: NVIDIA Corporation GP102GL [Tesla P40] (rev a1)
dpkg -l | grep -i nvidia
ii  libnvidia-cfg1-550:amd64             550.127.08-0ubuntu1                     amd64        NVIDIA binary OpenGL/GLX configuration library
ii  libnvidia-common-550                 550.127.08-0ubuntu1                     all          Shared files used by the NVIDIA libraries
ii  libnvidia-compute-550:amd64          550.127.08-0ubuntu1                     amd64        NVIDIA libcompute package
ii  libnvidia-container-tools            1.17.3-1                                amd64        NVIDIA container runtime library (command-line tools)
ii  libnvidia-container1:amd64           1.17.3-1                                amd64        NVIDIA container runtime library
ii  libnvidia-decode-550:amd64           550.127.08-0ubuntu1                     amd64        NVIDIA Video Decoding runtime libraries
ii  libnvidia-egl-wayland1:amd64         1:1.1.13-1build1                        amd64        Wayland EGL External Platform library -- shared library
ii  libnvidia-encode-550:amd64           550.127.08-0ubuntu1                     amd64        NVENC Video Encoding runtime library
ii  libnvidia-extra-550:amd64            550.127.08-0ubuntu1                     amd64        Extra libraries for the NVIDIA driver
ii  libnvidia-fbc1-550:amd64             550.127.08-0ubuntu1                     amd64        NVIDIA OpenGL-based Framebuffer Capture runtime library
ii  libnvidia-gl-550:amd64               550.127.08-0ubuntu1                     amd64        NVIDIA OpenGL/GLX/EGL/GLES GLVND libraries and Vulkan ICD
ii  nvidia-compute-utils-550             550.127.08-0ubuntu1                     amd64        NVIDIA compute utilities
ii  nvidia-container-toolkit             1.17.3-1                                amd64        NVIDIA Container toolkit
ii  nvidia-container-toolkit-base        1.17.3-1                                amd64        NVIDIA Container Toolkit Base
ii  nvidia-dkms-550                      550.127.08-0ubuntu1                     amd64        NVIDIA DKMS package
ii  nvidia-driver-550                    550.127.08-0ubuntu1                     amd64        NVIDIA driver metapackage
ii  nvidia-firmware-550-550.120          550.120-0ubuntu0.24.04.1                amd64        Firmware files used by the kernel module
ii  nvidia-firmware-550-550.127.08       550.127.08-0ubuntu1                     amd64        Firmware files used by the kernel module
ii  nvidia-kernel-common-550             550.127.08-0ubuntu1                     amd64        Shared files used with the kernel module
ii  nvidia-kernel-source-550             550.127.08-0ubuntu1                     amd64        NVIDIA kernel source package
ii  nvidia-prime                         0.8.17.2                                all          Tools to enable NVIDIA's Prime
ii  nvidia-settings                      565.57.01-0ubuntu1                      amd64        Tool for configuring the NVIDIA graphics driver
ii  nvidia-utils-550                     550.127.08-0ubuntu1                     amd64        NVIDIA driver support binaries
ii  nvtop                                3.0.2-1                                 amd64        Interactive NVIDIA GPU process monitor
ii  screen-resolution-extra              0.18.3                                  all          Extension for the nvidia-settings control panel
ii  xserver-xorg-video-nvidia-550        550.127.08-0ubuntu1                     amd64        NVIDIA binary Xorg driver
sudo modprobe nvidia
modprobe: ERROR: could not insert 'nvidia': Key was rejected by service

I have attached the nvidia bug report

nvidia-bug-report.log.gz (83.7 KB)
Any suggestions would be appreciated