First, this is the old BeagleBoard C2 based, so first are you using a
real externally powered USB 2.0 Hub?
2nd, read about the ehci hardware issue: http://elinux.org/BeagleBoard#EHCI
3rd, care to use an image with ubuntu that is actually supported by
someone now days?
Note, your board has the bootloader in NAND so you'll have to also follow:
As I guarantee my image will not work with some random bootloader installed..