This are my vagrant files to build sbc-os clean and reproducible.
~/_vagrant/sbc-os-generator (master)
$ vagrant --version
Vagrant 2.2.4
~/_vagrant/sbc-os-generator (master)
$ vagrant plugin list
vagrant-alpine (0.4.0, global)
vagrant-vbguest (0.17.2, global)
git clone https://github.com/khorsmann/sbc-os-generator.git