Looks like it doesn’t find the root filesystem. I guess, either because it’s not there or because it doesn’t look for the correct UUID.
Normally you get dropped to a shell. You can try to run “blkid” and look for the identifier and for the device name, or when you are in the grub menu press “e” and then go to the line with “/dev/disk/ …” and change this to the disk name (like /dev/sda1). There is some build option to decrease the disk size (need to look it up).
You can burn the image similar to the rpi ones to a disk (not neccessarily an SD card) see here: Build Documentation: Physical Isolation
For testing you can also use the raw image with KVM.
Even more easy maybe: Convert the official qcow2 gateway image to RAW and burn it to a disk. There are some related threads around here. Be careful when burning so you don’t overwrite something important.
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