Secure Boot is the hardest thing to ever get working correctly lots of extra work is needed to maintain. It really seems to only provide protection from a really small number of threats. If your careful Secure Boot is not needed. Infact if it ever did get used and took effect your computer would become unusable anyways requiring a reinstall of your boot loader and removal of any unsigned modules and drivers.
I recommend setup without Secure boot and you will most likely have better success.
I recommend setup without Secure boot and you will most likely have better success.