root@ubuntu4:~# systemctl cat kexec.target
# /lib/systemd/system/kexec.target
#  SPDX-License-Identifier: LGPL-2.1+
#
#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.

[Unit]
Description=Reboot via kexec
Documentation=man:systemd.special(7)
DefaultDependencies=no
Requires=systemd-kexec.service
After=systemd-kexec.service
AllowIsolate=yes

[Install]
Alias=ctrl-alt-del.target


root@ubuntu4:~# systemctl cat kexec-prepare.service
No files found for kexec-prepare.service.

root@ubuntu4:~# systemctl cat kexec-prepare
No files found for kexec-prepare.service.