virtualbox-ose-guest-dkms 4.0.4-dfsg-1ubuntu4 (i386 binary) in ubuntu natty

 VirtualBox is a free x86 virtualization solution allowing a wide range
 of x86 operating systems such as Windows, DOS, BSD or Linux to run on a
 Linux system.
 .
 This package provides the source code for the virtualbox guest addition kernel
 modules to be build with dkms. The virtualbox-ose-guest-utils package is also
 required in order to make use of these modules. Kernel sources or headers are
 required to compile these modules.