When building the latest version of whonix on buster the builder script 1120_prepare-build-machine tries to install the “virtualbox-source” and “virtualbox-qt” packages. Since they are not available on buster it fails.
Need to be installed from Debian sid.
I was able to successfully build using this method but it’s a dirty hack and it’s not recommended by debian creators. Are virtualbox-source, virtualbox-qt and virtualbox-dkms packages really needed or a simple virtualbox package from the virtualbox official repo is enough?
There are no VirtualBox packages in Debian
buster whatsoever. None.
 VirtualBox from VirtualBox repository might work too but I trust Debian sid over VirtualBox repository.
Third party repositories are discouraged as per:
Agreed however no better option than Whonix VirtualBox deprecation.
They have valid point too, however see .