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This question already has an answer here:

I have Windows XP as a guest in virtualbox and Ubuntu 12.04 as a host. I want to access the usb from windows xp, so I followed the instructions in this topic :

How to access USB in VirtualBox running Windows XP as guest OS

I installed the VirtualBox from the Oracle site, then I installed VirtualBox 4.0 Oracle VM VirtualBox Extension Pack

Then I added myself to the vboxusers using this commande : sudo adduser aimad vboxusers

But when I go to add the USB I get the message : no devices availaible, as in this picture:

enter image description here

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marked as duplicate by Javier Rivera, Uri Herrera, belacqua, Eric Carvalho, Basharat Sialvi Jun 7 '13 at 2:46

This question was marked as an exact duplicate of an existing question.

You may want to have a look at this Q&A: - if you still have issues, please let us know. – Takkat Jun 6 '13 at 6:22

The solution is just rebooting the OS

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No, not really, you just need to log-ou and log-in for the group change to work. – Javier Rivera Jun 6 '13 at 15:39

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