This bug is caused by a known problem in USB port caused by iLO (a HP technology) and is solved in last dapper kernel.
Instalation has an old kernel but the problem can be solved removing the usb module: uhci_hcd
$ modprobe -r uhci_hcd
Then you can update to last kernel.
There is more information in the bug #55495 and I will mark this as a duplicate.
This bug is caused by a known problem in USB port caused by iLO (a HP technology) and is solved in last dapper kernel.
Instalation has an old kernel but the problem can be solved removing the usb module: uhci_hcd
$ modprobe -r uhci_hcd
Then you can update to last kernel.
There is more information in the bug #55495 and I will mark this as a duplicate.