Comment 55 for bug 1081307

@Doug I've had a good experience with uninstalling Virtualbox packages that come from the Ubuntu repositories and instead getting Virtualbox directly from virtualbox.org's repository for Ubuntu.

Instructions: http://www.itworld.com/virtualization/308757/install-virtualbox-424-ubuntu-1204-or-1210

Works well for me even on 12.04.2 with the new kernel and it means you always have the latest Virtualbox version.