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I am currently using Ubuntu 11.04/natty under VirtualBox 4.0.12 with unity-2d. I have guest additions installed. I am not sure if this is VirtualBox-specific, but here is the problem:

After locking the screen, pressing the Windows key on the keyboard brings the Unity launcher on top of the lock screen. Pressing the Windows key again removes the launcher panel but the desktop remains visible where the menu was. You cannot interact with the desktop but you can see what the user was doing. I was not easily able to bring the login panel from the lock screen back but tabbing through the buttons/field brought them back.

This problem seems intermittent. I was able to get it to reproduce in the same manner several times but then it became random.

This definitely appears to be a bug, but is it a Ubuntu bug or a VirtualBox bug?

The following links are to screenshots, the first being the unity launcher under the lock screen and the second being the exposed desktop after unity is closed.

Exposed unity launcher

Exposed desktop

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closed as off topic by Marco Ceppi Feb 3 '12 at 0:22

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Yes, I forgot to mention that in the original article. I did that to try to get unity to work since it would not after the first install. The additions did not help on their own, but I found an article mentioning installing unity-2d and that worked. –  anjunatl Aug 2 '11 at 19:56
    
Not that I am aware of. According to the machine's display settings in VirtualBox, there's 12 MB for video memory, 1 monitor, and no 3D acceleration or 2D video acceleration. This is my work PC - I'm not sure it could handle the 3D if I toggled it. –  anjunatl Aug 2 '11 at 20:01
    
Launchpad.net would probably be a better place to report bugs. Right now, there isn't actually a question in your question. :) –  michaelms Aug 2 '11 at 20:14
    
@MichaelMS When I tried to report the bug via ubuntu-bugs, it sent me here. You're correct though, right now there isn't a question in the question. I suppose the question would be "Is this a Ubuntu bug or a VirtualBox bug?" –  anjunatl Aug 2 '11 at 20:26
    
@fossfreedom Adding memory and enabling 3D does work for the virtual machine, but it does slow it down considerably. However I couldn't get the problem to reproduce in that environment, so if it is a Ubuntu bug then it's in unity-2d. –  anjunatl Aug 2 '11 at 20:30

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