Comment 7 for bug 907390

Jsalisbury beat me to marking the bug as Invalid. just to clarify, the thing here is that Ubuntu now defaults to using the PAE kernel for 32-bit installs, due to it supporting other useful CPU features. So PAE support is pretty much a requirement. There's no actual bug in either Linux, Ubuntu (it's a decision, not a bug!) or VirtualBox (it *has* PAE support, it's just not enabled by default).

I'll try to get this documented and published somewhere (maybe the Ubuntu official system requirements page) so that it doesn't trip people up in the future.