virtualbox.org

I have Ubuntu 9.04. VirtualBox 2.2.4 was installed with Ubuntu 9.04. Working well. Now, with version 3 of VirtualBox, no. When Ubuntu 9.04 (installed in VirtualBox) is connected to internet, VirtualBox crash. How work bad, I installed new Ubuntu 9.04 in VirtualBox, but when connected to internet to download updates crash VirtualBox. Therefore, I can not install Ubuntu 9.04 in VirtualBox.

I have Windows XP installed on VirtualBox and it works very well.
I think the same thing that happens in this thread, http://forums.virtualbox.org/viewtopic.php?f=7&t=19540but in my case with Ubuntu.
I'm Spanish, sorry my english.

I got that operate by changing the network card. I put the Intel Desktop and it worked.