OSTechNix published a quick tutorial about how to fix the Implementation of the USB 2.0 controller not found! error in VirtualBox.
Fix "Implementation of the USB 2.0 controller not found!" VirtualBox Error
This brief guide explains how to fix "Implementation of the USB 2.0 controller not found!" error in VirtualBox in Linux.
Fix "Implementation of the USB 2.0 controller not found!" VirtualBox Error - OSTechNix