ubuntu16.04 no novnc service

[avyou]

hi , I connect vm console has error: Failed to connect to server (code: 1006) and:

Plain non-SSL (ws://) WebSocket connection
Version hybi-13, base64: 'False'
localhost:5900

ubuntu 16.04 system don't has this service:

$ sudo service novnc stop
$ sudo insserv -r novnc
$ sudo vi /etc/insserv/overrides/novnc

my supervisor configure:

[program:webvirtmgr]
command=/home/.virtualenv/kvm/bin/python /data/webvirtmgr/manage.py run_gunicorn -c /data/webvirtmgr/conf/gunicorn.conf.py
[program:webvirtmgr]
command=/home/.virtualenv/kvm/bin/python /data/webvirtmgr/manage.py run_gunicorn -c /data/webvirtmgr/conf/gunicorn.conf.py
directory=/data/webvirtmgr
autostart=true
autorestart=true
stdout_logfile=/var/log/supervisor/webvirtmgr.log
redirect_stderr=true
user=www-data

[program:webvirtmgr-console]
command=/home/.virtualenv/kvm/bin/python  /data/webvirtmgr/console/webvirtmgr-console
directory=/data/webvirtmgr
:q
tail -f /var/log/supervisor/webvirtmgr-console.log
autostart=true
autorestart=true
stdout_logfile=/var/log/supervisor/webvirtmgr-console.log
redirect_stderr=true
user=www-data

netstat -nltup

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      16002/nginx.conf
tcp        0      0 192.168.122.1:53        0.0.0.0:*               LISTEN      2658/dnsmasq    
tcp        0      0 0.0.0.0:6080            0.0.0.0:*               LISTEN      8989/python     
tcp        0      0 127.0.0.1:8321          0.0.0.0:*               LISTEN      8990/python     
tcp        0      0 0.0.0.0:10020           0.0.0.0:*               LISTEN      2111/sshd       
tcp        0      0 127.0.0.1:5900          0.0.0.0:*               LISTEN      7338/qemu-system-x8
tcp6       0      0 :::10020                :::*                    LISTEN      2111/sshd       
udp        0      0 192.168.122.1:53        0.0.0.0:*                           2658/dnsmasq    
udp        0      0 0.0.0.0:67              0.0.0.0:*                           2658/dnsmasq 

How to install novnc on ubuntu16 system?