Black screen from boot after installing CUDA on Ubuntu 18.04

Hi there,
I’ve spent quite some time trying to find someone with the same problem as me on this forum but didn’t not find a solution in similar issues topic.
I installed CUDA on my Ubuntu 18.04 computer with an nvidia RTX 2080 SUPER gpu. After the installation, my screen remains black (the screen doen’t detect any activity and automatically goes to sleep after some time), I don’t even have a boot up screen. The screen is actually plugged on the GPU DP port and the motherboard HDMI and VGA plugs are not usable.
I have seen that some people solved their issue by wiping their disk and installing ubuntu again or disabling secure boot, what I don’t know how to do without the possibility to see my bios.
I can still ssh my computer from another one but for some reasons,
sudo sh nvidia-bug-report.sh
returns
sh: 0: Can’t open nvidia-bug-report.sh
it seems that it has not been added to my PATH

also nvidia-smi
returns
NVIDIA-SMI has failed because it couldn’t communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.

Currently installed nvidia drivers are:
xserver-xorg-video-nvidia-430
nvidia-compute-utils-430
nvidia-dkms-430
nvidia-driver-418
nvidia-driver-430
nvidia-kernel-common-430
nvidia-kernel-source-430
nvidia-prime
nvidia-settings
nvidia-utils-430

At this point I’m not even trying to install cuda anymore but first to get my screen display back

Thank you in advance for your help