virtualbox-guest-dkms 6.1.4-dfsg-2 (amd64 binary) in ubuntu focal

 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. Kernel sources or headers are required to
 compile these modules.