root@rechner2-3-12:~# /usr/libexec/accounts-daemon --debug
(accounts-daemon:9005): DEBUG: entering main loop
(accounts-daemon:9005): DEBUG: Changing permission of /var/lib/AccountsService/users/vorlage to 0600
(accounts-daemon:9005): DEBUG: Changing permission of /var/lib/AccountsService/users/windows to 0600
(accounts-daemon:9005): DEBUG: Changing permission of /var/lib/AccountsService/users/linadmin to 0600
(accounts-daemon:9005): DEBUG: Changing permission of /var/lib/AccountsService/users/gnome-initial-setup to 0600
(accounts-daemon:9005): DEBUG: Changing permission of /var/lib/AccountsService/users/gdm to 0600
(accounts-daemon:9005): DEBUG: skipping user: root
(accounts-daemon:9005): DEBUG: skipping user: daemon
(accounts-daemon:9005): DEBUG: skipping user: bin
(accounts-daemon:9005): DEBUG: skipping user: sys
(accounts-daemon:9005): DEBUG: skipping user: sync
(accounts-daemon:9005): DEBUG: skipping user: games
(accounts-daemon:9005): DEBUG: skipping user: man
(accounts-daemon:9005): DEBUG: skipping user: lp
(accounts-daemon:9005): DEBUG: skipping user: mail
(accounts-daemon:9005): DEBUG: skipping user: news
(accounts-daemon:9005): DEBUG: skipping user: uucp
(accounts-daemon:9005): DEBUG: skipping user: proxy
(accounts-daemon:9005): DEBUG: skipping user: www-data
(accounts-daemon:9005): DEBUG: skipping user: backup
(accounts-daemon:9005): DEBUG: skipping user: list
(accounts-daemon:9005): DEBUG: skipping user: irc
(accounts-daemon:9005): DEBUG: skipping user: gnats
(accounts-daemon:9005): DEBUG: skipping user: nobody
(accounts-daemon:9005): DEBUG: skipping user: systemd-timesync
(accounts-daemon:9005): DEBUG: skipping user: systemd-network
(accounts-daemon:9005): DEBUG: skipping user: systemd-resolve
(accounts-daemon:9005): DEBUG: skipping user: syslog
(accounts-daemon:9005): DEBUG: skipping user: _apt
(accounts-daemon:9005): DEBUG: skipping user: messagebus
(accounts-daemon:9005): DEBUG: skipping user: uuidd
(accounts-daemon:9005): DEBUG: skipping user: lightdm
(accounts-daemon:9005): DEBUG: skipping user: whoopsie
(accounts-daemon:9005): DEBUG: skipping user: avahi-autoipd
(accounts-daemon:9005): DEBUG: skipping user: colord
(accounts-daemon:9005): DEBUG: skipping user: speech-dispatcher
(accounts-daemon:9005): DEBUG: skipping user: hplip
(accounts-daemon:9005): DEBUG: skipping user: kernoops
(accounts-daemon:9005): DEBUG: skipping user: pulse
(accounts-daemon:9005): DEBUG: skipping user: rtkit
(accounts-daemon:9005): DEBUG: skipping user: saned
(accounts-daemon:9005): DEBUG: skipping user: usbmux
(accounts-daemon:9005): DEBUG: loaded user: linadmin
(accounts-daemon:9005): DEBUG: skipping user: sshd
(accounts-daemon:9005): DEBUG: skipping user: ntp
(accounts-daemon:9005): DEBUG: skipping user: geoclue
(accounts-daemon:9005): DEBUG: skipping user: nm-openvpn
(accounts-daemon:9005): DEBUG: skipping user: postfix
(accounts-daemon:9005): DEBUG: skipping user: guest-3qs2su
(accounts-daemon:9005): DEBUG: loaded user: windows
(accounts-daemon:9005): DEBUG: loaded user: vorlage
(accounts-daemon:9005): DEBUG: skipping user: statd
(accounts-daemon:9005): DEBUG: skipping user: cups-pk-helper
(accounts-daemon:9005): DEBUG: skipping user: gdm
(accounts-daemon:9005): DEBUG: skipping user: gnome-initial-setup
(accounts-daemon:9005): DEBUG: skipping user: tss
(accounts-daemon:9005): DEBUG: skipping user: tcpdump
(accounts-daemon:9005): DEBUG: skipping user: _rpc
(accounts-daemon:9005): DEBUG: skipping user: avahi
(accounts-daemon:9005): DEBUG: skipping user: systemd-coredump
(accounts-daemon:9005): DEBUG: skipping user: motion
(accounts-daemon:9005): DEBUG: loaded user: gnome-initial-setup
(accounts-daemon:9005): DEBUG: loaded user: gdm
(accounts-daemon:9005): DEBUG: failed to load gdms custom.conf: Die Schlüsselwertedatei hat keinen Schlüssel »AutomaticLoginEnable« in der Gruppe »daemon«
(accounts-daemon:9005): DEBUG: got NameLost, exiting
(accounts-daemon:9005): DEBUG: exiting

Key "AutomaticLoginEnable" is commented out in /etc/gdm3/custom.conf.