Systemd init scripts not working for docker-registry

When installing docker-registry individually in a machine, it works well and the service can be started with systemd. But trying to enable it for boot time with

~# systemctl enable docker-registry

does not work. Also, when searching for it in the unit list, it shows as "static"

~# systemctl list-unit-files

UNIT FILE STATE
proc-sys-fs-binfmt_misc.automount static
...
docker-registry.service static
...

The only solution I found so far is to set the service as a desired one for multi-user.target.wants, by creating a symlink like

~# ln -s /lib/systemd/system/docker-registry.service /etc/systemd/system/multi-user.target.wants/docker-registry.service

Also, it seems to be an error in the /etc/init/docker-registry.conf upstart script, showing a duplicate "/etc" component path in the CONFIG variable

description "the Docker toolset to pack, ship, store, and deliver content"

start on local-filesystems
stop on runlevel [!2345]

respawn

setuid docker-registry

script
 BINARY=/usr/bin/$UPSTART_JOB
 CONFIG=/etc/etc/docker/registry/config.yml
 if [ -f /etc/default/$UPSTART_JOB ]; then
  . /etc/default/$UPSTART_JOB
 fi
 exec "$BINARY" "$CONFIG"
end script

# vim:set ft=upstart: