This file is indexed.

/usr/share/initramfs-tools/scripts/casper-bottom/16gdmnopasswd is in casper 1.340.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

PREREQ=""
DESCRIPTION="Setting up automatic login..."

prereqs()
{
       echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
       prereqs
       exit 0
       ;;
esac

. /scripts/casper-functions

log_begin_msg "$DESCRIPTION"

STRING1="               if (this._userManager.list_users().length > 2 || !(this._userManager.get_user('ubuntu')))\n \
                            return GdmUtil.fadeInActor(this._promptLabel); \/\/show\n \
                        else\n \
                            this._promptLabel.hide();"
STRING2="               if (this._userManager.list_users().length > 2 || !(this._userManager.get_user('ubuntu')))\n \
                            return GdmUtil.fadeInActor(this._promptEntry); \/\/show\n \
                        else\n \
                            this._promptEntry.hide();"

GDMLoginFile=/root/usr/share/gnome-shell/js/gdm/loginDialog.js

if [ -f $GDMLoginFile ]; then
    # Configure GDM autologin

    sed -i -e "s/^.*return GdmUtil.fadeInActor(this._promptLabel);\$/$STRING1/" \
           -e "s/^.*return GdmUtil.fadeInActor(this._promptEntry);\$/$STRING2/" \
           $GDMLoginFile

fi


log_end_msg