read /etc/adduser.conf , see adduser.conf (5); settings in deluser.conf may overwrite settings made in adduser.confpool. FILES /etc/adduser.conf SEE ALSO deluser.conf (5), addgroup (8), adduser (8), delgroup (8), deluserNAME systemd-system.conf, system.confNAME systemd-system.conf, system.conf