dkms apport error for Kernel 5.x

I'm not entirely sure what is happening here but I have not been able to update my kernel past 4.20.

I've used Ukuu to update my kernels for a while, but when I try to do it with 5.x I receive this error:

ERROR (dkms apprt): kernel package linux-headers-5.1.14-050114-generic is not supported

After googling I've seen people suggesting this is happening because my secure boot isn't disabled, but I'm positive it is.

I'm verifying it like this:

mokutil --sb-state
SecureBoot disabled
Platform is in Setup Mode

I'm not able to paste the Ukuu log since I can't copy it, but here's screenshots of the installation:

Any way to fix this? Can I get a quick explanation of what is going wrong here? Does my hardware just not support this new kernel?