There is a known problem with Ubuntu and 4Gb RPi4s that the USB interface doesn’t work unless memory is restricted to 3Gb. May or may not be related to your issue.
Refer to this thread:
There is a known problem with Ubuntu and 4Gb RPi4s that the USB interface doesn’t work unless memory is restricted to 3Gb. May or may not be related to your issue.
Refer to this thread:
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