Howto Install VirtualBox 1.6 in Ubuntu 8.04(Hardy Heron) including USB SupportJul 31, 2008, 08:00 (2 Talkback[s])
[ Thanks to dave for this link. ]
"By default USB support was disabled in virtualbox, so you’ll probably want to enable it. Otherwise you’ll get an error when you go into the “Settings” of your virtual machine. To correct this, you’ll need to edit the mountdevsubfs.sh file..."