On Ubuntu I had the same issue, the problem is that the virtual box display driver didn't load for you, after looking hard I found the solution
here.
Here is the solution that worked for me (I assume that you installed the guest addition and have an updated /etc/X11/xorg.conf like the one
here):
1. Open terminal.
2. Type the following commands:
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# cd /opt/VBoxGuestAdditions-3.2.10/src/vboxguest-3.2.10/vboxvideo/
# sudo make; sudo make install
3. Restart.
This seems like a simple issue to fix, and for me it is critical (I am one of the developers of
OGRE - so no 3d means I can't do anything ).
It was very hard to find the right solution for this issue, and basically it is an installer bug, so - please fix it.