Were you booting to Windows between first successful boot and one with this error? Are you sure you have secure boot disabled?
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To answer the first question, likely not. The answer to the second question is I am pretty sure. In my bios, I have secure boot control as disabled and secure boot grayed out on the "Not Active" setting
Sounds like the NVRAM on your motherboard is full. Try deleting old boot entries from the boot list (using efibootmgr or a GUI for that), or maybe even reset the motherboard to factory defaults.
You should be able to boot your OS if you disable secure boot. After that you can try to fix the problem and turn secure boot back on, or leave it off if you don't care for it.
How big is the root "/" partition?
maybe the efi partition is full if you are on uefi?
Nope. It is 512MB long and still have half its space left. And even if that were the case, the pen where I burned the fedora live iso would still boot :(