clex 3.15 fails in Ubuntu 16.04

[Gordon Hay]

Steps to reproduce:
1. Install `clex` on Ubuntu 16.04 LTS
2. Try to launch `clex`

Expected results:
* `clex` is opened and shows files and directories

Actual results:
* `clex` does no open, shows message in the terminal:

```
$ clex

Starting CLEX 3.15

Terminating CLEX: Cannot read the keyboard input

```

----

The CLEX 3.15 package has worked well for many years, but in 16.04 it fails.

CLEX 3.15 reached end-of-life in May 2011, but there is no Ubuntu package for the current CLEX release, 4.6.

The CLEX author has posted a workaround at http://www.clex.sk/, though he believes the problem is not in CLEX but in ncurses.

CLEX author will investigate with ncurses developers, but shouldn't there be a new Ubuntu package for the current CLEX release?

[Launchpad Janitor (janitor)]

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

[Norbert (nrbrtx)]

ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CurrentDesktop: MATE
DistroRelease: Ubuntu 16.04
InstallationDate: Installed on 2018-08-07 (6 days ago)
InstallationMedia: Ubuntu-MATE 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
Package: clex 3.15-1build1
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 4.15.0-30.32~16.04.1-generic 4.15.18
Tags: xenial
Uname: Linux 4.15.0-30-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True

[Norbert (nrbrtx)]

apport information

[Norbert (nrbrtx)]

apport information

[Norbert (nrbrtx)]

apport information