Oops, my mistake, I forgotten to take a copy of the related dmesg log, and I 
rebooted.  Some lines  that are worth looking at, are these lines: 
Jan 29 19:37:18 tyf-S551LN kernel: [24979.506831] usb usb2: root hub lost power 
or was reset
Jan 29 19:37:18 tyf-S551LN kernel: [24979.506833] usb usb3: root hub lost power 
or was reset

I will run the apport-collect command now.

Thanks!

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https://bugs.launchpad.net/bugs/1416238

Title:
  USB randomly stops working on Kubuntu 12.04

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