/usr/share/livecd-rootfs/live-build/ubuntu-server/includes.binary/overlay/lib/systemd/system/getty@.service.d/autologin.conf is in livecd-rootfs 2.525.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [Service]
ExecStart=
ExecStart=-/sbin/agetty --noclear -n --autologin ubuntu-server %I $TERM
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