Screenshot only shows desktop background or completely black (12.04)

[Hans Vos]

Hello Liane,

>> Hello,
>>
>> I want to make a couple of screen shots of running applications. When I
>> press the print screen button it makes a screen shot sound and I get the
>> dialog window for saving the screen shot, but nothing is in it.
>> Previously
>> it only showed my desktop background but now it is completely black.
>>
>> I tried installing another application called Shutter but this program
>> has
>> the same behavior. I am running Ubuntu Desktop 12.04 LTS inside a Virtual
>> Box environment on a Windows 7 host system. I already asked for some
>> support over at Virtual Box but I got referred back to Ubuntu being told
>> it must be a guest problem.
>>
>> I hope somebody can provide a solution for my problem.
>>
>> Kind regards,
>>
>> Hans Vos
>>
> Hi,
>
> I have the same problem and already tried installing the guest additions
> within the VM. The problem seems to be the 3D-acceleration. If I
> deactivate the option in my Virtualbox-settings, I can make screenshots
> like before with every application I try (shutter, screencloud..). I
> know this is just a workaround because obviously withour 3D you are back
> to Unity-2D as Unity needs it..
>

That seems to have worked for me. It is not a definitive solutions but I 
managed to make the screenshots I needed. Afterwards I turned on 3D 
Acceleration.

Kind regards,

Hans Vos