To add even more points to this discussion which are similar to the previous two postings. The wires inside the USB cable for charging are a different set of wires than for data exchange. So the charging wires could work quite nicely while the data exchange wires don't.
Try a different cable on the same port with your Kobo. Or try a different device on that same cable and same port to ensure it's not the cable. Then try the Kobo on a different port as it's possible that that particular port is wonky.
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