I recently migrated my development VirtualBox .VDI disk images from an old storage pool. After setting up a new container for my Ubuntu 12.04.3 LTS images, networking would fail to start up.
I am currently using a virtual Intel PRO/1000 MT Desktop (82450EM) adapter, which is bridged to my Realtek PCIe GBE Family Controller.
To fix networking, perform the following:
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Once restarted, confirm existance of the primary interface (likely eth0):
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You should see something like the following:
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DHCP has assigned 192.168.1.144/24. Perfect!
Happy virtualizing.