Ubuntu :: Arised After VirtualBox Installation In Karmik?

I have installed VirtualBox via virtualbox-ose package and it works fine (also installed needed addons), but i can't enable USB on it. I have karmik release installed, but manual at[url].... I discover 2 problems on my system:

1. It does not have /proc/bus/usb directory and when i try to mkdir it:

Code:
baleks@BAleks-netbook:~$ LANG=C sudo mkdir /proc/bus/usb
mkdir: cannot create directory `/proc/bus/usb': No such file or directory
baleks@BAleks-netbook:~$ ls /proc/bus
input pci

so my entry in fstab to mount /proc/bus/usb not works. Moreover, when i trying to mount that in /dev/bus/usb (althought this directory already exist and with files) mount tells me: mount: unknown filesystem type 'usbfs'

2. virtualbox-ose package does not created user group vboxusers (or any like that) in /etc/group, even after reinstallation of the package. 1 and 2 is two steps to get USB work in VirtualBox, and i don't know what to do.. Attempts to google this problems almost always gets me to the posts/manuals related to older verions of ubuntu, but i have karmik..