Hello CapitanMcFly,

many thanks for pointing me onto the right spot.


The following settings helped:

xHCI handoff - Disabled (was Enabled)
EHCI handoff - Disabled 
IOMMU controller - Enabled (was Disabled)

Installation of Ubuntu Studio 16.04 successfully finished (USB devices
were recognized and LAN was also working).

@Joseph Salisbury

As soon as I have fixed my RAID issues (no disks are recognized on the
Marvel SATA controller - internal AMD controllers are fine) I will try
to test that new mainline kernel.


Good night

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

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

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