Simple-cdd is unusable at least with the arm64 platform. I updated my Debian testing to latest packages and the process stops at the very beginning to reprepo errors:
xfce@amlogic:~/Downloads/cd$ build-simple-cdd --local-packages /home/xfce/Downloads/cd/debs/ --profiles desktop 2018-04-19 06:28:38 ERROR reprepro: updating package lists exited with code 255 2018-04-19 06:28:38 ERROR Last 5 lines of standard error: 2018-04-19 06:28:38 ERROR reprepro: updating package lists: aptmethod got 'http://ftp.be.debian.org/debian/dists/buster-updates/InRelease' 2018-04-19 06:28:38 ERROR reprepro: updating package lists: aptmethod got 'http://ftp.be.debian.org/debian/dists/buster/InRelease' 2018-04-19 06:28:38 ERROR reprepro: updating package lists: aptmethod got 'http://ftp.be.debian.org/debian/dists/buster/InRelease' 2018-04-19 06:28:38 ERROR reprepro: updating package lists: aptmethod got 'http://ftp.be.debian.org/debian/dists/buster/InRelease' 2018-04-19 06:28:38 ERROR reprepro: updating package lists: There have been errors! 2018-04-19 06:28:38 ERROR reprepro failed with exit code: 255
