You left out the NVIDIA card part. This is super important. So you have two kernels in a bad state and the NVIDIA driver is probably not building out.
You’ve got a chicken and egg issue.
This isn’t a technical answer but simply a generalization of what probably needs to happen.
I would start over on whatever kernel situation you have going.
First uninstall the NVIDIA driver.
Then remove that unsigned kernel and its headers. Use the force option if necessary.
Ensure dkms, the base kernel and its headers are installed.
Reboot using standard kernel and then install nvidia-dkms package. Reboot.
It’s tough to tell you exactly what needs to be done because I’m not really sure what kind of damage you did or what the full extent of the errors are. You might need some force options or whatever but generally that’s all that needs to happen. YOU do not have a NVIDIA driver built for whatever kernel you’re using.