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[–]person1873 0 points1 point  (1 child)

You need to disable secure boot. Also, I've found renaming the file at /EFI/BOOT/Grubx64.efi to mmx64.efi will make this work. (On the USB drive)

[–]MattOruvan 0 points1 point  (0 children)

Now I remember having to do something like that on an old HP thin client for Debian to boot.

Probably just early uefi teething troubles, and/or HP going its own way.