1.Stop your VM and open its settings in the VirtualBox (OSE) Manager
2.Go to the Network tab
3.Select the network mode at your choice (bridged networking or host-only) (in the
below example, I'm using host-only)
If you want to use bridged networking, you've to select the right network adapter at
Name. For wired connections, you'd select something named like eth0. Wireless
connections are usually named wlan0 (the numbers may vary)
4.Save the settings
5.Start the Ubuntu VM
6.When up, you can gather the IP address by running:
ifconfig ' grep addr