I have it working. Apparently, the drone didn't like the first USB drive I tried to use, because it worked with a different one.
I'm leaving this open as unanswered because I don't know why it didn't like the first USB thumb drive. I ran badblocks on it, and didn't find any bad sectors, not sure what else could have been the problem. Any ideas?
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It is hard to understand what happened with the first USB drive. A possibility is that the image was corrupted when creating the bootable USB drive.
Let me know if you have any further questions.