virtualbox-guest-additions 4.0.4-1 (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 an iso image which contains the guest additions
 for Linux, Solaris and Windows to be installed on the host system. The guest
 systems then can mount the iso and install the guest additions from there.