Can be temporarily fixed this way:

Open a terminal and try this:

VBoxManage modifyvm "VMNamexxx" --natdnshostresolver1 on

VMNamexxx is the name of your VM machine.


source: 
https://forums.virtualbox.org/viewtopic.php?f=15&t=51485&p=236259#p236098

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https://bugs.launchpad.net/bugs/1058769

Title:
  In 12.10 beta2, VirtualBox has no access to network

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