なんかいっぱい居るな
2つしか試したこと無い

stretch
$ apt-file search /sbin/shutdown
molly-guard: /sbin/shutdown
systemd-sysv: /sbin/shutdown
sysvinit-core: /sbin/shutdown

sid
$ apt-file search /sbin/shutdown
molly-guard: /sbin/shutdown
runit-init: /sbin/shutdown
systemd-sysv: /sbin/shutdown
sysvinit-core: /sbin/shutdown