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

Status in pptpd package in Ubuntu:
  Confirmed
Status in pptpd source package in Xenial:
  Fix Released

Bug description:
  [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  stuff of since pptpd seems to be outdated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)

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