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I've got a 13.04 guest running under OS X, and have been having trouble getting my Ubuntu VM to use conventional resolutions (currently uses 4:3 aspect ratio with horizontally compressed UI, even though the 16:9 host display exhibits none of these issues), and to resize normally (currently can only resize while preserving aspect ratio). I've installed guest additions, but don't see the option to "auto-adjust the guest display" (as described on various fora).

How can I get Ubuntu to resize dynamically – or at all – under VirtualBox?

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Did you (accidentally) activate Virtual Box scale mode (HOST + C)? Also Guest Additions are needed for Auto-adjust the display. –  Takkat Jul 25 '13 at 19:31
    
It was initially activated, but turning it off was one of the steps I took before asking the question. It allows me to resize the window, but the virtual display doesn't resize. I essentially get an infinitely-resizable grey bezel around the virtual display. –  Jules Mazur Jul 25 '13 at 19:36
    
That's what happens when the guest additions don't work. –  Takkat Jul 25 '13 at 19:37
    
I've solved/circumvented the problem: for some reason, the problem does not exist when I enter full screen mode. –  Jules Mazur Jul 25 '13 at 19:46
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