This is most likely Secure Boot related. I would disable it, then enter ujust enroll-secure-boot-key in the terminal on the next boot and enter the password universalblue and turn Secure Boot back on, and see if the error still occurs.
This is most likely Secure Boot related. I would disable it, then enter ujust enroll-secure-boot-key in the terminal on the next boot and enter the password universalblue and turn Secure Boot back on, and see if the error still occurs.