diskimage-builder/diskimage_builder/elements/ubuntu-minimal/environment.d/10-ubuntu-distro-name.bash

export DISTRO_NAME=ubuntu
export DIB_RELEASE=${DIB_RELEASE:-xenial}
export DIB_DEBIAN_COMPONENTS=${DIB_DEBIAN_COMPONENTS:-main,restricted,universe}
export DIB_DISTRIBUTION_MIRROR=${DIB_DISTRIBUTION_MIRROR:-http://archive.ubuntu.com/ubuntu}