I copy the iso to usb using the command
sudo dd bs=4M if=./manjaro-xfce-21.2.1-minimal-220103-linux515.iso of=/dev/sda1 status=progress oflag=sync
and previously
sudo dd bs=4M if=./manjaro-xfce-21.2.1-220103-linux515.iso of=/dev/sda1 status=progress oflag=sync
The current manjaro xfce iso’s when booting in UEFI both resulted in an
Error: Unknown file system
and a grub rescue prompt which
ls
gave (hd0) (hd1)
Legacy mode gave a screen with just GRUB in top left
I then dd ed an old 2018 manjaro iso onto one of the USBs (that failed with the latest image), and was able to boot up the nuc in both UEFI and Legacy mode with the old live USB.
I now have a separate challenge updating a 2018 version to today