How to resolve USB device is disabled in Ubuntu Virtualbox

项目告一段落，有时间搞搞偶滴虚拟机了，偶的宿主机是Ubuntu，虚拟机是XP，插上USB设备之后虚拟机一直识别不出来，从网上搜罗一下找到有效滴解决方案

Refer to: http://blog.csdn.net/evilcode/article/details/6319945

1. Add Groups:

groupadd usbfs

#groupadd vboxusers(this is added automatically)

2. Add user into the groups

sudo adduser [username] usbfs

sudo adduser [username] vboxusers

3. Restart Ubuntu

4. Launch Virtual Machine-Devices-USB Devices-Select the correct USB device item

Now, you will see the USB device in your virtual machine :)