Messages:
hub 1-0:1.0: unable to enumerate USB device on port 6
hub 3-0:1.0: unable to enumerate USB device on port 6
reiteratively  made it impossible to work on console.

@Franco (sed: couldn't flush stdout: No existe el dispositivo)
I got the same message although in German ;-). 

Workaround:
Edit /etc/rc.local

Insert the following:

cd /sys/bus/pci/drivers/ehci_hcd
for i in `ls -d 0000:00:*`;do echo $i > unbind;sleep 5; echo $i > bind; done

See also #79 (Thanks to J B).

You see: I unbind and then bind the ehci entries again. If I don't bind
the entry again, one of the message keeps spaming the console. Binding
again let vanish the messages.

Compared to J B's suggestions I had not to touch the ohci entries.

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https://bugs.launchpad.net/bugs/256767

Title:
  USB devices work, but constant syslog errors "unable to enumerate USB
  device on port 5"

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