I have a Linux Ubuntu 20.04 system in a clean room, which I use for testing a scientific camera for a stratospheric telescope mission. The problem I am facing is that the drivers of the frame grabber card that I use with the camera are not compatible with kernels 5.8.x. I did not know it at first and I updated the system two months ago by mistake to fix another issue. When I figured out that I could not build the frame grabber drivers again, I kept using the old 5.4.0-80 kernel that was still installed on system and available in grub and it worked fine up to today.
Today I came back to the lab and saw that the 5.4.0-x kernels are removed from grub by unattended-upgrade process yesterday (based on log).
I reinstalled the kernel I needed, but now unfortunately the graphic drivers are somehow missing. I tried updating but I had no success. The newer kernel versions work still fine. But there are no active graphic drivers when I boot in the old kernel version. might it be that the graphic drivers are somehow updated and are not compatible with the old kernel anymore? Is there a way to roll back a specific driver? and how should I know which Intel driver to use for this specific kernel?
I am sure there are several logs that I should provide to get a useful answer. I apologize in advance for it. I tried around the internet alittle but I mainly find questions on how to upgrade drivers, it seems that my problem is alittle different.But given that I have limited access time to clean room, I do not have access to that system right now anymore. It would be very helpful and I appreciate it very much if anyone can kindly give me some suggestions of what I should do generally in such a situation, so that I can try it in clean room next time and then I can report some specific information.I am not that knowledgeable in these topics and I am not a trained software engineer. So if my questions are very basic, I am sorry.
I theoretically can start from scratch and install Ubuntu again with the kernel I need, but I have alot of libraries built on this system, which took me a full week last time. I would very much like to avoid it if possible.
Thank you very much