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I have a Mobile Broadband USB dongle. When I plug it into the usb 2.0 port ubuntu recognizes it and connects quickly, but on a usb 3.0 port ubuntu does not recognize it at all! This problem is NOT unique, and I have experienced it with many brands of dongles and laptops. (but all on ubuntu 12.04). Please help.

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You can include result of lsusb in both case. Probably you are facing same issue as Ubuntu 12.04 - USB3 issue with mobile broadband usb sticks. Also do a dmesg -c, plug it on usb2.0, once recognized then execute & post result of dmesg here. Again unplug, clear dmesg (dmesg -c), replug. Post the output of dmesg again. Don't post the result as comment. You can edit your question using edit –  Web-E Apr 18 '13 at 7:53
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