I am using VirtualBox on Ubuntu 8.04 to run 8.10. I need to get a (fairly large) file out of the virtual machine. I first tried putting in a DVD. Unfortunately, I cannot get it to recognize that a DVD has been put in (although the host does recognize it). Then I tried to use my USB flash drive, which caused an error:
Finally, when I tried to install the guest additions (by going to the devices menu), nothing happened.
Failed to attach the USB device Patriot Memory  to the virtual machine
Not permitted to open the USB device, check usbfs options.
What do I do?