Unable to start calendarsserver 7.0 on ubuntu 16.04 LTS 64 bit

Hello,

Here is my configuration :

 lsb_release -rd
Description: Ubuntu 16.04 LTS
Release: 16.04
 apt-cache policy calendarserver
calendarserver:
  Installed: 7.0+dfsg-2
  Candidate: 7.0+dfsg-2
  Version table:
 *** 7.0+dfsg-2 100
        100 /var/lib/dpkg/status
     7.0+dfsg-1 500
        500 http://archive.ubuntu.csg.uzh.ch/ubuntu xenial/universe amd64 Packages

Step to reproduce :

Install the calendarserver package on ubuntu 7.0 on ubuntu 16.04 LTS and follow the REeadme file at :

/usr/share/doc/calendarserver/README.Debian

For more information see :

https://answers.launchpad.net/ubuntu/+source/calendarserver/+question/291443

Actual result :

When I enter this command in a terminal :

systemctl status calendarserver.service
● calendarserver.service - LSB: Calendar and Contacts Server
   Loaded: loaded (/etc/init.d/calendarserver; bad; vendor preset: enabled)
   Active: active (exited) since mer. 2016-04-20 10:57:58 CEST; 10h ago
     Docs: man:systemd-sysv-generator(8)
  Process: 1545 ExecStart=/etc/init.d/calendarserver start (code=exited, status=
    Tasks: 0 (limit: 512)

Warning: Journal has been rotated since unit was started. Log output is incomple

why is there the message ; "bad; vendor preset: enabled)"

For more information see :
https://answers.launchpad.net/ubuntu/+source/calendarserver/+question/291632

Expend result :

Calendarserver 7.0 work

Could you help me please to fix this bug ?

Tanks for your support

Best regards

Battant