Usermod behaves strangely (Fedora 18)

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http://forums.fedoraforum.org – Hello, I am having trouble with usermod in Fedora 18. I use Virtualbox, and I need to add my username to the vboxusers group (in order for usb devices to work if I am not mistaken but that isn't the point). However, when I try Code: sudo usermod -a -G vboxusers <my_username> nothing seems to happen. When i use id, it only shows the other groups i belong to, and Virtualbox still insists I have to add myself to the group. So, I decided there might be some user privilige issue despite the sudo, so i did a su and tried Code: usermod -a -G vboxusers <my_username> When I (HowTos)