Hi Andrew That you for your interest in Debian and Vagrant Boxes. I read you mail it details, and it seems that you have rather a problem with the debian installer, rather than with the existing Debian boxes.
If you want to have a debian sid system in Vagrant, you should use one of the testing boxes available here: https://app.vagrantup.com/debian/boxes/testing64 https://app.vagrantup.com/debian/boxes/contrib-testing64 and update the system to debian sid with apt. AFAIK sid is a quick moving target and is never guaranteed to have a working installer. Emmanuel
