[Bug 1712817] Re: postinst fails if the service is disabled via systemd

[Robie Basak]

Based on https://irclogs.ubuntu.com/2018/04/13/%23ubuntu-
devel.html#t11:56, this sounds valid for either init-system-helpers or
debhelper.

13:47 <xnox> rbasak, the description sounds valid. i believe i have hit
something similar before, thus yeah a fix to debhelper for this class of
issues would be most welcomed.

13:47 <rbasak> xnox: thanks. debhelper, or invoke-rc.d?

13:48 <xnox> rbasak, my understanding was that maintainer scripts that
are generated, do attempt to check if a thing was "enabled and active"
before the upgrade; and post upgrade. But maybe they only do so for
systemd native units, and not for init.d->systemd units.


** Also affects: debhelper (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
  postinst fails if the service is disabled via systemd

Status in debhelper package in Ubuntu:
  New
Status in init-system-helpers package in Ubuntu:
  New

Bug description:
  When updating my Xenial with freeradius installed but not active I got
  the following error:

      Setting up freeradius-common (2.2.8+dfsg-0.1ubuntu0.1) ...
      Setting up libfreeradius2 (2.2.8+dfsg-0.1ubuntu0.1) ...
      Setting up freeradius-utils (2.2.8+dfsg-0.1ubuntu0.1) ...
      Setting up freeradius (2.2.8+dfsg-0.1ubuntu0.1) ...
      Setting up freeradius-ldap (2.2.8+dfsg-0.1ubuntu0.1) ...
      freeradius.service is not active, cannot reload.
      invoke-rc.d: initscript freeradius, action "force-reload" failed.
      dpkg: error processing package freeradius-ldap (--configure):
       subprocess installed post-installation script returned error exit status 1

  
  lsb_release -rd
  Description:	Ubuntu 16.04.3 LTS
  Release:	16.04

  apt-cache policy freeradius-ldap # before update
  freeradius-ldap:
    Installed: 2.2.8+dfsg-0.1build2
    Candidate: 2.2.8+dfsg-0.1ubuntu0.1
    Version table:
       2.2.8+dfsg-0.1ubuntu0.1 500
          500 http://fr.archive.ubuntu.com/ubuntu xenial-security/universe amd64 Packages
          500 http://fr.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
   *** 2.2.8+dfsg-0.1build2 500
          500 http://fr.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
          100 /var/lib/dpkg/status

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