[Pkg-postgresql-public] Bug#848869: Error: could not create default cluster. Please create it manually with

[Darshaka Pathirana]

Package: postgresql
Version: 9.4+165+deb8u1
Severity: normal

Dear Maintainer,

when installing postgresql on a freshly setup Debian/Jessie system the
following error is shown:

  Setting up postgresql-common (165+deb8u1) ...
  
  Creating config file /etc/postgresql-common/createcluster.conf with new version
  
  Creating config file /etc/logrotate.d/postgresql-common with new version
  Building PostgreSQL dictionaries from installed myspell/hunspell packages...
  Removing obsolete dictionary files:
  Setting up postgresql-9.4 (9.4.9-0+deb8u1) ...
  Error: The locale requested by the environment is invalid.
  Error: could not create default cluster. Please create it manually with
  
    pg_createcluster 9.4 main --start
  
  or a similar command (see 'man pg_createcluster').
  update-alternatives: using /usr/share/postgresql/9.4/man/man1/postmaster.1.gz to provide /usr/share/man/man1/postmaster.1.gz (postmaster.1.gz) in auto mode
  Setting up postgresql (9.4+165+deb8u1) ...

Locale looks like this:

  % locale
  LANG=en_US.UTF-8
  LANGUAGE=en_US:en
  LC_CTYPE="en_US.UTF-8"
  LC_NUMERIC="en_US.UTF-8"
  LC_TIME="en_US.UTF-8"
  LC_COLLATE="en_US.UTF-8"
  LC_MONETARY="en_US.UTF-8"
  LC_MESSAGES="en_US.UTF-8"
  LC_PAPER="en_US.UTF-8"
  LC_NAME="en_US.UTF-8"
  LC_ADDRESS="en_US.UTF-8"
  LC_TELEPHONE="en_US.UTF-8"
  LC_MEASUREMENT="en_US.UTF-8"
  LC_IDENTIFICATION="en_US.UTF-8"
  LC_ALL=en_US.UTF-8

Why is this happening? Anything I can do to help to pinpoint the problem?

Thank you for maintaining and your help!

Regards,
 - Darsha

-- System Information:
% lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 8.6 (jessie)
Release:        8.6
Codename:       jessie

Kernel: Linux 3.16.0-4-amd64 #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) x86_64 GNU/Linux
Init: % /sbin/init -> /lib/systemd/systemd