Many cases of this seem to be related to bad cabling - either your external USB cable, or internal USB may not be able to run at USB "High Speed"/
Details: http://ubuntuforums.org/showthread.php?p=3991125#post3991125 Enhancement request: https://bugs.launchpad.net/ubuntu/+source/linux-meta/+bug/177430/
Many cases of this seem to be related to bad cabling - either your external USB cable, or internal USB may not be able to run at USB "High Speed"/
Details: ubuntuforums. org/showthread. php?p=3991125# post3991125 /bugs.launchpad .net/ubuntu/ +source/ linux-meta/ +bug/177430/
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Enhancement request:
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