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-Daily Ubuntu Tips – Fix Black Screen In Ubuntu Guest With VirtualBox Screen Capture
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-VirtualBox is a software that allows users to run multiple guest operating systems on a single host computer. It’s supports Windows, Mac OS X and Linux and is maintained my Oracle.
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-We’ve written a lot on VirtualBox here. Do a quick search and you’ll see all the articles about VirtualBox.
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-Now, here’s the story: VirtualBox comes with a feature that allows users to quickly take or capture screen shots of active guest machine sessions. These screenshots can then be shared with the host machine using the clipboard.
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-The sad thing about it is, it won’t work if certain feature in Ubuntu guest machines is enabled. It had always been a pain until just recently when I stumbled upon the solution.
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-Without this solution, when you take a screenshot in Ubuntu guest machines, the image will be completely dark and not useful at all.
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-I dug solutions with no luck until just now.
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-To enable bidirectional clipboard with Ubuntu guest and the host machine, click on the Ubuntu guest machine and select **Settings**. Then navigate to **General –> Advanced Tab** and enable it.
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-![](http://www.liberiangeek.net/wp-content/uploads/2014/02/virtualboxsharedclipboard.png)
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-Now, in theory, when you start the Ubuntu guest machine and press the **Print Screen** key or **Ctrl + Print Screen** keys, the guest machine should take a screenshot of its current desktop session. 
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-You can then save it to the clipboard and access these images from the host machine.
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-But if you also enable **3D Acceleration** feature for Ubuntu guests, the images will be completely dark.
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-To fix that, you must disable 3D acceleration for Ubuntu guest machines.
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-To disable it, select the Ubuntu guest machine and click **Settings**. Then navigate to **Systems – Display –> Video** tab and disable 3D Acceleration.
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-![](http://www.liberiangeek.net/wp-content/uploads/2014/02/virtualboxsharedclipboard1.png)
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-Well, you must disable 3D for Ubuntu guests in order to get this to work. Now launch the guest machine and try taking a screen shot.
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-Hope this helps.
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-Enjoy!
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-via: http://www.liberiangeek.net/2014/02/daily-ubuntu-tips-fix-black-screen-in-ubuntu-guest-with-virtualbox-screen-capture/
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-译者：[FineFan](https://github.com/译者ID) 校对：[校对者ID](https://github.com/校对者ID)
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-本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出