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When running Ubuntu as a Vitualbox guest, with a Windows 7 64-bit machine as host, how can I maximize the screen so it fills up the whole monitor?

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Do you find @Anton's answer insufficient? If so, please comment on what else you're looking for. If it solved your problem, please accept it as an answer. – tjameson Sep 9 '11 at 18:31
Duplicate? unix.stackexchange.com/questions/3889/… – Eugene S Apr 28 '12 at 13:39

I think you need to install virtualbox guest additions (virtualbox-ose-guest-utils package). Screen size will resize then automatically.

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Under Ubuntu 12.04 I first had to install the virtualbox guest additions. And after that I also had to go to "System Settings" -> "Hardware - Additional Drivers" and activate "Oracle VM VirtualBox Guest Additions for Linux Module", because by default it was still de-activated.

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