Enable USB device support for VirtualBox on Ubuntu 12.04 __virtualbox

As we all know, VirtualBox uses the host's USB device to install the expansion pack. According to their own vbox version, to the VBox official website download the corresponding expansion packs.

For example, my vbox is 4.1.12, and the corresponding extension package address is:
Http://download.virtualbox.org/virtualb ... ox-extpack

After downloading, in the "Management" menu under the "Global Settings" in the "Extended" tab, add, Enable.

As shown in figure:


After that, turn on the virtual system settings and, under the "USB Devices" tab, check "Enable USB Controller" and "2.0 controllers" to increase support for USB2.0.

As shown in figure:

Supposedly this time has been taken care of. But there is no USB device in the USB list. This is why. Google a bit, found an article (the specific address has been unable to recall, embarrassed), explained the reason.

The user group that originally was VBox must include the current user.

View Current user name:
sharl@sharl-laptop:~$ WhoAmI
Sharl

View the group in which VBox is located:
sharl@sharl-laptop:~$ Cat/etc/group | grep VBox
Vboxusers:x:125:sharl

Add the current user to the VBox group:
Usermod-a-G vboxusers Sharl

Can.

At this point, reboot the system. Turn on the virtual machine again, sure enough, USB devices have been recognized, access to.
These, as you can see on the "Devices" menu.

As shown in figure:

After adding, the virtual machine system found the new hardware, in accordance with the general steps, installation drive can be used normally.