package libdjvulibre21 3.5.27.1-5 failed to install/upgrade: triggers ci file contains unknown directive 'libebook-1.2.so.16'

[vrignaud]

impossible in english I'm not a professional, just a "happy" user.
Every time I want to load new packages, one of them (always the same) doesn't want to get load...since months (before the last version fews weeks ago)

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: libdjvulibre21 3.5.27.1-5
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
Date: Mon Oct 8 12:51:58 2018
DuplicateSignature:
 package:libdjvulibre21:3.5.27.1-5
 Preparing to unpack .../9-libdjvulibre21_3.5.27.1-8_amd64.deb ...
 dpkg: error processing archive /tmp/apt-dpkg-install-UtpeVA/9-libdjvulibre21_3.5.27.1-8_amd64.deb (--unpack):
  triggers ci file contains unknown directive 'libebook-1.2.so.16'
ErrorMessage: triggers ci file contains unknown directive 'libebook-1.2.so.16'
InstallationDate: Installed on 2016-10-13 (724 days ago)
InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.3ubuntu0.1
SourcePackage: djvulibre
Title: package libdjvulibre21 3.5.27.1-5 failed to install/upgrade: triggers ci file contains unknown directive 'libebook-1.2.so.16'
UpgradeStatus: No upgrade log present (probably fresh install)