On startup and on closing Ubuntu (14.04 LTS) displays many lines like
[ 14.212517] hub 1-8:1.0: hub_port_status failed (err = -71)
Then the computer seems to work ok, although there seems to be some HD activity all the time. The file(s) dmesg.log are flooded with the above lines. I suspect there is some kind of an USB conflict. It is on a 10 years old desktop with dual boot to Windows XP. What should I do, where should I look?