Script error while installing redmine

[Jean-Max Reymond]

When installing redmine-pgsql on Ubuntu 14.04.1 LTS, error is reported
/var/lib/dpkg/info/redmine.postinst: 297: [: -ne: unexpected operator

apt-get install redmine-pgsql
...
Creating config file /etc/redmine/default/session.yml with new version
A new secret session key has been generated in /etc/redmine/default/session.yml
Redmine instance "default" database must be configured manually.
Clearing the cache directory for redmine instance "default".
This may take a while.
/var/lib/dpkg/info/redmine.postinst: 297: [: -ne: unexpected operator
Setting up libfcgi0ldbl (2.4.0-8.1ubuntu5) ...
Setting up ruby-fcgi (0.9.2.1-1) ...
Setting up libfcgi-ruby1.9.1 (0.9.2.1-1) ...
Setting up ruby-json (1.8.0-1build1) ...
Setting up ruby-oj (2.5.3-1) ...
Setting up ruby-yajl (1.2.0-1) ...
Processing triggers for libc-bin (2.19-0ubuntu6.5) ...

$ apt-cache policy redmine-pgsql
redmine-pgsql:
  Installed: 2.4.2-1
  Candidate: 2.4.2-1
  Version table:
 *** 2.4.2-1 0
        500 http://mirrors.online.net/ubuntu/ trusty/universe amd64 Packages
        100 /var/lib/dpkg/status
$ lsb_release -rd
Description: Ubuntu 14.04.1 LTS
Release: 14.04

[Launchpad Janitor (janitor)]

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