Visit the download site for virtual box:
Get the version that matches your Ubuntu, install the .deb package by double clicking and follow the instructions.
This should get your Virtual Box up and running, but what about USB support?
I'm proud to mention that this step just got a whole simpler.
Type this on the console:
echo "none /proc/bus/usb usbfs devgid=$(grep plugdev /etc/group | sed 's/plugdev:x:\(.*\):.*/\1/'),devmode=664 0 0" | sudo tee -a /etc/fstab
sudo /etc/init.d/vboxdrv setup
After these steps all you need to do is reboot and start working with VirtualBox.
USB can now be selected from the virtual machine configuration.
These instructions came from this article: