I suspect you’re either missing the kernel headers or you have the signed, pre-compiled modules installed which only work with the stock kernel.
In the first case, please reinstall headers
sudo apt install linux-headers-$(uname -r)
then check dkms status if the modules appear.
In the latter case, purge and reinstall the driver
https://forums.developer.nvidia.com/t/switched-to-lowlatency-kernel-and-now-nvidia-driver-not-loading/247869
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