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[Skiold <1242321@xxxxxxxxxxxxxxxxxx>]

Hi, I've installed Ubuntu-Gnome 16.04 yesterday on my HP-ProDesk-PC, dual boot with Windows 10.
This computer has four USB 3.0 ports and two USB 2.0 ports. 
Same problem here with Ubuntu partition, not in Windows 10 partition. 
My external Toshiba HDD seems to have power, it is rotating and blinking, but it is recognized immediately only on USB 2.0 ports, not in USB 3.0 ports.
After rebooting system, USB 3.0 ports works fine but only just one time. If you unmount the device the problem starts again.
Another detail: On USB 2.0 ports the Toshiba HDD blinks in white light; on USB 3.0 ports blinks in blue light (such in Ubuntu as in Windows).

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https://bugs.launchpad.net/bugs/1242321

Title:
  USB 3.0 Harddrive not recognised

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu is not recognising any device plugged into any USB 3.0 ports.
  Sometimes Ubuntu will freeze for a few seconds when you plug something
  into a USB 3.0 port; when Ubuntu comes out of the freeze, the device
  is still NOT recognised.

  No problems with USB 2.0 ports and devices.

  The USB 3.0 on this computer only works in Windows 7 (I'm dual booting
  Ubuntu 13.10 and Windows 7, both are 64-bit).

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