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  • The only way to disable Secure Boot is through UEFI.
    – Ramhound
    Commented Jun 18, 2022 at 0:41
  • All motherboards I've encountered allow adding a Secure Boot entry on the UEFI firmware Boot page (you'd have to do this for each distro you'd like to boot that doesn't support Secure Boot)? For the firmware passphrase, the motherboard's OEM's support site should have info on how to clear it, else you'll have to contact them directly - as others have mentioned, it's a firmware accessible option only.
    – JW0914
    Commented Jun 18, 2022 at 11:46