Notes from some installs I did:

Install a fresh Debian Buster
# nano /etc/apt/sources.list

deb http://deb.devuan.org/merged beowulf main
deb http://deb.devuan.org/merged beowulf-updates main
deb http://deb.devuan.org/merged beowulf-security main

# apt-get update --allow-insecure-repositories
# apt-get install devuan-keyring --allow-unauthenticated
# apt-get update
# apt-get upgrade
# apt-get install eudev
# apt-get -f install
# reboot
# apt-get dist-upgrade
# apt-get purge systemd libnss-systemd
# apt-get autoremove --purge
# apt-get clean
# sed -i 's/beowulf/chimaera/g' /etc/apt/sources.list
# apt-get update
# apt-get upgrade
# reboot
# apt-get dist-upgrade
# reboot
# apt-get install dialog
# apt-get purge emacsen-common iamerican ibritish ienglish-common laptop-detect wamerican whiptail
# apt-get purge linux-image-4.19.0-18-amd64 linux-image-4.19.0-6-amd64
# apt-get purge python python2 python3
# apt-get purge python2.7 python3.7 python3.9
# apt-get purge python2.7 python3.7 python3.9 python2-minimal python2.7-minimal python3-minimal python3.7-minimal python3.9-minimal
# apt-get autoremove --purge
# apt-get clean
# reboot