How interesting!
It suggests an error in the USB data restricted to a place where it does not affect either the installation process or the result of installation… or a difference in the hardware use between the test and the installation which gives reproducible data errors in one but not the other.
If you are interested, there is a test to find where on your key are the error(s) seen, in this fine post by @apparatus :
https://forum.qubes-os.org/t/an-unknown-error-ocurred-during-installation-on-empty-partition/28811/4
You will need to run the command on a machine where you have both access to the full USB device, and the original good iso file. Change ‘/dev/sdd’ to match the device of your USB key.
If the output is impossibly long, the following post shows use of head and tail to cut it down.
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