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[CapitanMcFly <superrafa.3008@xxxxxxxxx>]

I've been reading about it because I had the same problem when trying to load 64 bit linux mint OS from an USB stick and it seems that it happens with Gigabyte motherboards... (I have Gigabyte GA-990XA-UD3)
I found the solution here:
http://forums.anandtech.com/showthread.php?t=2367766

Configure your BIOS with the following parameters:
xHCI handoff - Enabled
EHCI handoff - Enabled
IOMMU controller - Enabled

Regards.

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https://bugs.launchpad.net/bugs/1574869

Title:
  USB controllers are not recognized (live and install 16.04 Xenial)

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  USB controllers are not recognized on  Ubuntu Studio 16.04 LTS on a
  Gigabyte GA-990FXA-UD5 system [on chip 2.0 controller (via AMD SB950)
  and external onboard 3.0 controller (Etron EJ168)].  Changing EFI
  values in BIOS has no effect - system performs nominally within
  Win8.1.

  DVD boots (EFI and legacy load) the live system where no USB devices
  are recognized.

  USB stick boots (EFI and legacy) with a menu but soon ends with the
  following msg:

  [	4.667018] usb 4-3: device descriptor read/64, error -32
  [	4.896013] usb 4-3: device descriptor read/64, error -32
  [	5.248018] usb 4-3: device descriptor read/64, error -32
  [	5.477047] usb 4-3: device descriptor read/64, error -32
  [	6.105027] usb 4-3: device not accepting address 4, error -32
  [	6.632023] usb 4-3: device not accepting address 4, error -32
  [	6.632068] usb usb4-port3: unable to enumerate USB device

  
  BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash)
  Enter 'help' for a list ob built-in commands.

  (initramfs) Unable to find a medium containing a live file system

  
  Last but not least Ubuntu Studio cant be installed due to other bugs (LAN failure and EFI grub installation abort).

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