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I have Ubuntu 12.04 host and cannot detect usb devices on windows 7 guest on virtualbox (guest-addon is installed), though I configured vboxusers group and enabled it for my user account and still cannot detect any device :(

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Do you have anything plugged in to USB? – Mitch Jul 5 '12 at 15:19
have you tried setting exclusive access via the menu (of the running machine) Devices->USB Devices and then clicking on the specific device (if listed)? – onse Jul 5 '12 at 15:20
Did you follow this: – Takkat Jul 5 '12 at 15:21

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