package cltl 1.0.28 failed to install/upgrade: installed cltl package post-installation script subprocess returned error exit status 1

[Richard R. Joslin]

The program would not upgrade/update.

ProblemType: Package
DistroRelease: Ubuntu 18.04
Package: cltl 1.0.28
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
Date: Sat Jun 2 17:15:55 2018
ErrorMessage: installed cltl package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2018-06-02 (0 days ago)
InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
RelatedPackageVersions:
 dpkg 1.19.0.5ubuntu2
 apt 1.6.1
SourcePackage: cltl
Title: package cltl 1.0.28 failed to install/upgrade: installed cltl package post-installation script subprocess returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Weldon Goree (wmgoree)]

postinst in function download_file() calls `wget --compression=none`, which option causes wget to exit with an error (despite the fact that wget(1) documents the option).