[Bug 1574144] Re: package openstack-dashboard-ubuntu-theme 2:9.0.0-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Corey Bryant]

Looking into this some more, the maintainer scripts are following the
Debian guidance for enabling config for Apache 2.4.  For example, in
openstack-dashboard.postinst we have:

if [ -e /usr/share/apache2/apache2-maintscript-helper ] ; then
  # apache 2.4
  . /usr/share/apache2/apache2-maintscript-helper
  apache2_invoke enconf $CONF || exit $?
elif ...

which follows the guidance from:
https://wiki.debian.org/Apache/PackagingFor24

This is intended to exit if the package's apache config can't be enabled
when the package is installed, which is the case when apache2 is not
running at package install time.

So we are doing the right thing to exit if config can't be enabled.
However I wonder if we could help alleviate this bug by attempting to
start apache2 if it's not already started.  I'll consult with some
fellow package maintainers and see what they think.

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https://bugs.launchpad.net/bugs/1574144

Title:
  package openstack-dashboard-ubuntu-theme 2:9.0.0-0ubuntu2 failed to
  install/upgrade: subprocess installed post-installation script
  returned error exit status 1

Status in horizon package in Ubuntu:
  Triaged

Bug description:
  ı hate this bug and ubuntu theme always causing problems

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: openstack-dashboard-ubuntu-theme 2:9.0.0-0ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  Date: Sun Apr 24 05:19:10 2016
  DuplicateSignature:
   Setting up openstack-dashboard-ubuntu-theme (2:9.0.0-0ubuntu2) ...
   Collecting and compressing static assets...
   apache2.service is not active, cannot reload.
   dpkg: error processing package openstack-dashboard-ubuntu-theme (--configure):
    subprocess installed post-installation script returned error exit status 1
  ErrorMessage: subprocess installed post-installation script returned error exit status 1
  InstallationDate: Installed on 2016-04-23 (0 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1
   apt  1.2.10ubuntu1
  SourcePackage: horizon
  Title: package openstack-dashboard-ubuntu-theme 2:9.0.0-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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