I don't know if this makes a difference, but it's not the USB hub that causes the problem. I "burned" the install image onto a microSD card for a seperate trial, put the microSD card into the PC's microSD card slot and booted with the hub disconnected. The result was the same - the USB port was shut down. I even tried removing the USB keyboard dongle immediately after starting the boot process so that the USB port was empty. Same result.
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