redet is broken on Ubuntu Bionic

[Norbert]

Steps to reproduce:
1. Install Ubuntu 18.04 LTS
2. Install `redet` package with `sudo apt-get install redet`
3. Try to run redet from GUI terminal with `redet`

Expected results:
* redet window is opened

Actual results:
* redet window is not opened, terminal shows the following error:

$ redet
Error in startup script: can't find package Itcl 3.4
    while executing
"package require Itcl 3.4"
    (file "/usr/share/tcltk/iwidgets4.1.0/iwidgets.tcl" line 18)
    invoked from within
"source /usr/share/tcltk/iwidgets4.1.0/iwidgets.tcl"
    ("package ifneeded Iwidgets 4.1.0" script)
    invoked from within
"package require Iwidgets"
    (file "/usr/bin/redet" line 27)

Note: first seen on AskUbuntu - https://askubuntu.com/q/1031632/66509

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: redet 8.26-1.2
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
Architecture: amd64
CurrentDesktop: MATE
Date: Thu May 3 23:29:39 2018
InstallationDate: Installed on 2018-04-26 (6 days ago)
InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: redet
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[Ludwin Janvier (lud-janvier)]

fixed upstream (in Debian testing) since version redet/8.26-1.3

Quick and dirty work-around:
wget http://ftp.debian.org/debian/pool/main/r/redet/redet_8.26-1.3_all.deb
sudo apt --fix-broken install ./redet_8.26-1.3_all.deb