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I've installed win7 on virtualbox on ubuntu 12.04. However, the full screen mode isn't perfect. I have black parts on both sides of the screen. I tried changing the resolution but nothing fits. Anyway to fix this?

By the way, my ubuntu is 64-bit (intel 4000 graphic card), and the my win7 is 32-bit. I'm not sure if this is the cause of the issue.

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Have you installed the virtualbox extensions and guest additions? – amc Sep 6 '12 at 16:59
no I just installed it from the software center. So could you kindly tell me how do I get these extensions and additions? – stupidity Sep 6 '12 at 17:05
up vote 21 down vote accepted

You need to install the VirtualBox guest additions. Start Windows in your Virtualbox, and from the Virtualbox menu select "Devices -> Install guest additions"

enter image description here

Guest additions allow you a more seamless integration with the Linux desktop. Not only will you be able to have a better resolution and automatically adjust the resolution to the X window size, but in addition your mouse pointer will no longer be trapped by the Windows host, you will be able to share folders and more. See here.

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Thanks a lot. Full screen mode is perfect now :) – stupidity Sep 6 '12 at 17:17
I install that but nothing happened :( – zhilevan May 14 '15 at 10:48
SO unfair. Doing it in ubuntu is soo freakin hard. – Arulx Z Jul 19 '15 at 8:11

Open main window of VM - Virtualbox.
Example 1

Click File (upper left) or Ctrl+G - Preferences Display
Set Hint --> Screen Size the same as main system.

Example 2

Back to main window, left side choose virtual system you want to start.

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It does not work for me. – Phuc Nguyen Jul 28 '15 at 3:58

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