8 - TRAVIS_DEBIAN_DISTRIBUTION=stretch
9 - TRAVIS_DEBIAN_DISTRIBUTION=unstable TRAVIS_DEBIAN_INCREMENT_VERSION_NUMBER=true
12 - docker run koalaman/shellcheck:stable --version
13 - docker run -v "$(pwd)":/code koalaman/shellcheck:stable -e SC2181 /code/chroot-script /code/grml-debootstrap
14 - wget -O- http://travis.debian.net/script.sh | sh -