Ping Fails for Default Gateway on Bridged Connecting with VirtualBox - Ubuntu 11 Desktop

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http://askubuntu.com – I'm trying to setup a development server on my computer using Ubuntu 11.10 \n \l (Desktop, 64bit AMD) and VirtualBox 4.1.8r. I have installed the Guest Addtitions from the VirtualBox "Devices" > "Install Guest Additions" menu. The installation went smoothly, and I was able to connect to the internet using the default NAT network setup. However, what I really want is to have a dedicated IP for this instance of Ubuntu that is reachable from my Windows network. To do so, I have tried switching to the Bridged network mode. Upon doing this, Ubuntu immediately drops my network connection (which is (HowTos)