Comment 44 for bug 1099947

yes, it seems, it's vboxusers group related, because it should be uucp group

could you test what happens if you manually change the group to uucp?

in output of
lsusb
you'll see something like
...
Bus 003 Device 002: ID 0463:ffff MGE UPS Systems UPS

so we need /dev/bus/usb/003/002 to have uucp group:

chmod 0660 /dev/bus/usb/003/002
chown root:uucp /dev/bus/usb/003/002

and try to start nut (without user=root)

If you replug ups to other port, it'll probably be something else than ../003/002, so change the commands accordingly

please add output of
rpm -ql VirtualBox

and attach VirtualBox's files from /lib/udev/rules.d/ and /etc/udev/rules.d/

thanks