Note, this is one of two vmdebootstrap issues blocking the creating of Debian Stretch based images for Raspberry Pi 3 using only packages in Debian, see <URL: https://wiki.debian.org/RaspberryPi3 >.
It would be great if it could be possible to create RPi images using only vmdebootstrap and a list of options. :) -- Happy hacking Petter Reinholdtsen