I am trying to boot Ubuntu Server 64-bit 20.04 from a USB SSD thumb drive on a RPi3B+. I have found that on three separate RPi3B+ units, they ALL fail to find the drive if it is placed in either of the two USB slots NOT right next to the ethernet socket.
I have also tried with a crappy flash drive, which succeeds on booting in an even more inconsistent manner.
Are there any suggestions as to why USB booting of Ubuntu Server 20.04 seems to be so inconsistent on the RPi3B+? Any remedies to this?
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