Invalid settings detected with VirtualBox + Ubuntu

If you are seeing the following error Invalid settings detected when you are trying to enable USB 2.0 (EHCI) Controller on your VirtualBox Machine is because you don't have installed the Oracle VM VirtualBox Extension Pack

Just download from here the last extension pack and double click on in to install it ;)

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Update: Related problem

If you are having problem detecting your USB devices in VirtualBox you should have a look to this post