如何在Ubuntu系統上之Virtualbox 使用USB裝置

For Natty Narwhal (  Ubuntu 11.04 )

Add yourself to the user group vboxusers, then log out and back in, to make use of available USB devices. To do this via the graphical interface, click System Settings/Users and Groups/Manage Groups. 

Reference:
[1] Mount USB Devices in Virtualbox with Ubuntu - How-To Geek
http://www.howtogeek.com/howto/31726/mount-usb-devices-in-virtualbox-with-ubuntu/
[2] VirtualBox/USB - Community Ubuntu Documentation
https://help.ubuntu.com/community/VirtualBox/USB