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Old 07-09-2004, 04:32 AM   #1
LQ Newbie
Registered: Aug 2003
Location: London, Engerland
Distribution: Debian (kernel 2.6.0)
Posts: 14

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Question Gtk-WARNING **: Locale not supported by C library

Each time I try and run an application on my Debian install after a dist upgrade it complains about the language being all wrong. Has anyone else bumped into this problem? It currently means that I cannot run certain programs (ones that rely on gtk).

(process:1935): Gtk-WARNING **: Locale not supported by C library.
         Using the fallback 'C' locale.  

(straw:1935): Gdk-WARNING **: locale not supported by C library Traceback (most recent call last):   File "/usr/bin/straw", line 17, in ?     s = straw.Main()   File "/usr/lib/straw/straw/", line 41, in __init__     self._setlocale()   File "/usr/lib/straw/straw/", line 105, in _setlocale     locale.setlocale(locale.LC_ALL, '')   File "/usr/lib/python2.3/", line 381, in setlocale     return _setlocale(category, locale) locale.Error: unsupported locale setting
Old 12-06-2006, 10:37 AM   #2
Registered: Feb 2004
Location: Chester, UK
Distribution: Linux From Scratch. 64 bit. Kernel 5.8.3. Fluxbox.
Posts: 53

Rep: Reputation: 22
locale not supported by C library

Hi -

I've just rebuilt my glibc (don't try that unless you are a bit mad - its very easy to get it wrong and end up with an unusable system). I needed the new posix compliant threading stuff. But the point is that after I did that I ran into very similar problems to the one you reported. The Google located suggestions of altering environment variables didn't help at all. But at last I stumbled across localedef, which is a command line function for compiling the locale definition files. In my case what I needed was
localedef -c -f iso885915 -i en_GB en_GB.iso885915
run as super-user.

That has done the trick for me. I'm not quite sure whether its persistent, because I haven't rebooted the system. But one sure sign is that if you run
locale -a
and it moans, then there is something wrong.
Well locale works fine now, and the Gtk warnings have stopped.

I hope that helps someone else.

1 members found this post helpful.
Old 07-04-2008, 07:54 AM   #3
Registered: Apr 2007
Location: Sydney
Distribution: Debian. (Formerly Slackware, Gentoo, RHEL, and Suse)
Posts: 80

Rep: Reputation: 15
And still good value after all these years

Thanks champ, this sorted a locale annoyance I'd been having on Ubuntu...

localedef -c -f iso88591 -i en_US en_US.ISO-8859-1
Old 04-13-2011, 12:29 PM   #4
LQ Newbie
Registered: Feb 2005
Posts: 16

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On some distributions this simpler command might also help,

dpkg-reconfigure locales
2 members found this post helpful.
Old 06-21-2011, 06:59 AM   #5
Registered: Nov 2008
Distribution: Ubuntu Maverick
Posts: 31

Rep: Reputation: 16
Originally Posted by louisgag View Post
On some distributions this simpler command might also help,

dpkg-reconfigure locales
Thank you for that command. I was facing the same issue after generating a lot of locale definition files with locale-gen (I did Ctrl-C a few times which probably resulted in corrupted locale definition files). That 'dpkg-reconfigure' command recompiled all the locales I had previously compiled which solved the problem.
1 members found this post helpful.
Old 08-08-2014, 01:47 PM   #6
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Registered: Jan 2007
Distribution: Ubuntu Edgy
Posts: 7

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Impossible locale combo?


I had this problem because my system tried to run with the locale "sv_US".

Once I installed Swedish (sv) language support completely I got things running.

Check by running "locale" in the command prompt. The locales set there should be something possible (unlike sv_US...)


Last edited by erikalm; 08-08-2014 at 01:48 PM.
Old 08-11-2014, 02:55 PM   #7
Registered: Apr 2004
Location: Mesa, AZ USA
Distribution: Slackware 14.1 kernel 4.1.13 gcc 4.8.2
Posts: 246

Rep: Reputation: 22
I have this problem under Slackware 13.37. It's more of an annoyance as the lib falls back to the C locale method. Apparently the Locale stuff never got installed correctly. The environment varibles have no effect.


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