This bug was fixed in the package pptpd - 1.4.0-7ubuntu0.2
--------------- pptpd (1.4.0-7ubuntu0.2) xenial; urgency=medium
* Backport "Fix systemd check in postinst." from 1.4.0-9 fixed via Debian bug 829418 (LP: #1610500)
-- Simon Deziel <email address hidden> Wed, 28 Jun 2017 17:44:00 +0000
This bug was fixed in the package pptpd - 1.4.0-7ubuntu0.2
---------------
pptpd (1.4.0-7ubuntu0.2) xenial; urgency=medium
* Backport "Fix systemd check in postinst." from 1.4.0-9
fixed via Debian bug 829418 (LP: #1610500)
-- Simon Deziel <email address hidden> Wed, 28 Jun 2017 17:44:00 +0000