postinst scripts for stork-server and stork-agent do not run on Debian
if [ -x "$(command -v busybox)" ]; then
addgroup -S stork-server
adduser -h $home_dir -D -S -H -g "Stork Server User" -G stork-server stork-server
This is a snippet provided in the Debian package within the postinst file. Neither addgroup nor adduser support any single character options. So this script errors for many reasons.