After upgrading from 13.1 -> 13.2 -> 42.1, two instances of ntp are running,
which doesn't seem right.

Output of ps aux | grep ntp:
ntp       4053  0.0  0.0  19716  4296 ?        Ss   16:00   0:00 /usr/sbin/ntpd
-p /var/run/ntp/ntpd.pid -g -u ntp:ntp -i /var/lib/ntp -c /etc/ntp.conf
root      4057  0.0  0.0  19292   540 ?        S    16:00   0:00 /usr/sbin/ntpd
-p /var/run/ntp/ntpd.pid -g -u ntp:ntp -i /var/lib/ntp -c /etc/ntp.conf

Output of systemctl status ntpd.service:
ntpd.service - NTP Server Daemon
   Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled)
  Drop-In: /run/systemd/generator/ntpd.service.d
           ������50-insserv.conf-$time.conf
   Active: active (running) since Fri 2016-05-20 16:00:50 BST; 19min ago
     Docs: man:ntpd(1)
 Main PID: 4053 (ntpd)
   CGroup: /system.slice/ntpd.service
           ������4053 /usr/sbin/ntpd -p /var/run/ntp/ntpd.pid -g -u ntp:ntp -i
/var/lib/ntp -c /etc/ntp.conf
           ������4057 /usr/sbin/ntpd -p /var/run/ntp/ntpd.pid -g -u ntp:ntp -i
/var/lib/ntp -c /etc/ntp.conf

uname -r:
4.1.20-11-default

/etc/ntp.conf:
# ntp.conf: Managed by puppet.
#

# Permit time synchronization with our time source, but do not'
# permit the source to query or modify the service on this system.'
restrict 127.0.0.1


server vulpecula.bitsofstring.co.uk iburst
server 192.168.0.1 iburst

# Undisciplined Local Clock. This is a fake driver intended for backup
# and when no outside source of synchronized time is available.
server  127.127.1.0
fudge   127.127.1.0 stratum 10
restrict 127.127.1.0

# Driftfile.
driftfile /var/lib/ntp/drift/ntp.drift

Thoughts? Thanks.