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lsusbanddmesgare key points of investigation - you are looking for a USB device and or failure or driver messages after insertion. Something that is not CDC/ACM would probably be more likely to be /dev/ttyUSB0 or similar, if it recognized with a driver available.usb-devicesis also useful - it can show what driver (if any) is attached to a USB device.lsusb. Cannot decipher anything useful fromdmesg.