software-properties-gtk crashed with Error in setlocale(): unsupported locale setting

[Guillaume-Jean Herbiet]

This problem might be related to the fact that, upon triggering auto-completion in a terminal window, I get the following error:
bash: warning: setlocale: LC_CTYPE: cannot change locale (en)
bash: warning: setlocale: LC_CTYPE: cannot change locale (en)

This is the output of the locale command:
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=en
LANGUAGE=en
LC_CTYPE="en"
LC_NUMERIC="en"
LC_TIME="en"
LC_COLLATE="en"
LC_MONETARY="en"
LC_MESSAGES=en_GB.UTF-8
LC_PAPER="en"
LC_NAME="en"
LC_ADDRESS="en"
LC_TELEPHONE="en"
LC_MEASUREMENT="en"
LC_IDENTIFICATION="en"
LC_ALL=

And the output of lsb_release -rd
Description: Ubuntu Natty (development branch)
Release: 11.04

Regards,

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: software-properties-gtk 0.80.5 [modified: usr/share/applications/software-properties-gtk.desktop]
ProcVersionSignature: Ubuntu 2.6.38-7.38-generic 2.6.38
Uname: Linux 2.6.38-7-generic x86_64
Architecture: amd64
Date: Mon Mar 21 16:41:54 2011
ExecutablePath: /usr/bin/software-properties-gtk
InstallationMedia: Xubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110321)
InterpreterPath: /usr/bin/python2.7
ProcCmdline: /usr/bin/python /usr/bin/software-properties-gtk -n -t 56623233
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=en_US
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-properties-gtk', '-n', '-t', '56623233']
SourcePackage: software-properties
Title: software-properties-gtk crashed with Error in setlocale(): unsupported locale setting
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #730643, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.