virtualbox-ose-source 2.2.2-dfsg-2ubuntu2 (i386 binary) in ubuntu karmic

 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 kernel module.
 The virtualbox-ose package is also required in order to make use of these
 modules. Kernel sources or headers are required to compile this module.