[Bug 1610500] [NEW] package pptpd 1.4.0-7ubuntu0.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

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[Impact]

Users with pptpd will encounter errors when upgrading from 14.04->16.04.
After the upgrade process, pptpd won't automatically start on boot.

[Test case]

1. Setup a Trusty container
  lxc launch ubuntu-daily:trusty foo
2. Install pptpd
  lxc exec foo /bin/bash
  apt-get install -y pptpd
3. Upgrade to Xenial
  lxc exec foo /bin/bash
  # make do-release-upgrade happy
  script -c "/bin/bash -l" /dev/null
  chmod 777 /var/run/screen
  do-release-upgrade
4. Notice that pptpd fails to install properly and
   apport is invoked

To confirm the fix, enable trusty-proposed before running the "do-
release-upgrade". This will pull pptpd 1.4.0-7ubuntu0.2 from xenial-
proposed and should let the upgrade complete successfully.

[Regression potential]

Risks of regressions should be minimal since the fix have been included
in Yakkety and Debian already. Worst case, users will still need to
manually start the pptpd service on boot.

[Original issue description]

This is one of the crashed that happened during upgrade to 16.04 LTS.
The install routine was exited with a script error. Try to figure stuff
of since pptpd seems to be outdated

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: pptpd 1.4.0-7ubuntu0.1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic i686
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: i386
Date: Fri Aug  5 21:40:28 2016
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2011-02-25 (1988 days ago)
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release i386 (20100816.1)
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt  1.2.12~ubuntu16.04.1
SourcePackage: pptpd
Title: package pptpd 1.4.0-7ubuntu0.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to xenial on 2016-08-05 (0 days ago)

** Affects: pptpd (Ubuntu)
     Importance: High
         Status: Confirmed

** Affects: pptpd (Ubuntu Xenial)
     Importance: Undecided
     Assignee: Simon Déziel (sdeziel)
         Status: Fix Released


** Tags: apport-package i386 patch verification-done verification-done-xenial xenial
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package pptpd 1.4.0-7ubuntu0.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/1610500
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