I've gone through the posts and am still confused.
Host: Ubuntu 12.04, 64-bit
Guest: XP Pro, SP3, 32-bit
Virtualbox 4.1.12 Ubuntu
USB drives don't work, with an error message re "vboxusers". I've tried "sudo usermod -a -G vboxusers username", with no luck. All the other help I've seen refers to other vbox/ubuntu combinations.
Any help will be appreciated