无法启动 uWSGI Emperor： Unit uwsgi.service failed to load: No such file or directory.

我是新手。 Ubuntu 15.10 ，
已经添加了这个文件 /etc/init/uwsgi.conf ：
description "uWSGI"
start on runlevel [2345]
stop on runlevel [06]
respawn

env UWSGI=/usr/local/bin/uwsgi
env LOGTO=/var/log/uwsgi/emperor.log

exec $UWSGI --master --emperor /etc/uwsgi/vassals --die-on-term --uid www-data --gid www-data --logto $LOGTO



现在执行以下命令都无效
sudo service uwsgi start:
Failed to start uwsgi.service: Unit uwsgi.service failed to load: No such file or directory.

sudo initctl start:
sudo: initctl: command not found

sudo start uwsgi:
sudo: start: command not found