error:
Implementation of the USB 2.0 controller not found!
The device will be disabled. You can ignore this warning but there will be no USB 2.0 support in your VM. To fix this issue, either install the 'Oracle VM VirtualBox Extension Pack' or disable USB 2.0 support in the VM settings.
解决：
wget
$ VBoxManage extpack install Oracle_VM_VirtualBox_Extension_Pack-4.0.0-69151.vbox-extpack
重启VM， guest 也一定要重启
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