[Bug 1784065] Re: upgrade from 14.04 to 16.04 fails due to `interest-await' in trigger

[Beat]

Update to my comment #8:
The upgrade from 14.04 to 16.04 failed later again on package gconf2

dpkg: error processing package gconf2 (--configure):
 dependency problems - leaving triggers unprocessed
dpkg: dependency problems prevent processing triggers for gconf2:
 gconf2 depends on python:any; however:
  Package python is not configured yet.

And many other packages.

This PC has been installed with Ubuntu 12.04, then upgraded to 14.04,
and now upgrading to 16.04 fails with the bug described in this tracker
item and leaves the system not upgraded and not upgradable. Reverting
now to 14.04 from backup and postponing upgrade to 16.04.

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https://bugs.launchpad.net/bugs/1784065

Title:
  upgrade from 14.04 to 16.04 fails due to `interest-await' in trigger

Status in glib2.0 package in Ubuntu:
  Triaged

Bug description:
  Package failed to install.

  ProblemType: Package
  DistroRelease: Ubuntu 16.04
  Package: libglib2.0-0 2.48.2-0ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-131.157-generic 4.4.134
  Uname: Linux 4.4.0-131-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  Date: Fri Jul 27 18:31:08 2018
  DuplicateSignature:
   package:libglib2.0-0:2.48.2-0ubuntu3
   Preparing to unpack .../libglib2.0-0_2.48.2-0ubuntu3_amd64.deb ...
   dpkg: error processing archive /var/cache/apt/archives/libglib2.0-0_2.48.2-0ubuntu3_amd64.deb (--unpack):
    triggers ci file contains unknown directive `interest-await'
  ErrorMessage: triggers ci file contains unknown directive `interest-await'
  InstallationDate: Installed on 2015-03-31 (1213 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  RelatedPackageVersions:
   dpkg 1.18.4ubuntu1.4
   apt  1.2.27
  SourcePackage: glib2.0
  Title: package libglib2.0-0 2.48.2-0ubuntu3 failed to install/upgrade: triggers ci file contains unknown directive `interest-await'
  UpgradeStatus: Upgraded to xenial on 2018-07-27 (0 days ago)

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