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Cant boot from usb on a system 76 with custom firmware.
(lemmy.sdf.org)
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Is secure boot turned on?
Yes I have LUKS encryption enabled so I think I have to have secure boot enabled. Should I try to disable it?
I would do further research, as this is based on my experience with VMs, but some ISOs refuse to boot when the VM is set to Secure Boot.
I wonder if that's why you're having trouble. I believe drive encryption and Secure Boot are separate protections (one being disk encryption and one being a way to assert system integrity). Trying to boot from a USB might be causing Secure Boot to freak out, since it's not the system your BIOS expects.
My initial thought is that you should be able to use LUKS without Secure Boot, but please don't take my word for it. Do further research. I am not an expert in this, just a passing enthusiast trying to help point you in a direction.