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Remove unwanted locales on Ubuntu / Debian

Posted 10-31-2010 at 04:18 AM by bittner
Updated 11-01-2010 at 09:43 AM by bittner
Tags debian, locale

Sometimes you feel bothered by too many locales (pre)installed on your Debian system. If I run a server I typically want basic stuff on it, so for locales "en_US-UTF8" is enough.

Which locales are installed on my machine?
You can check which locales are generated and configured on your system using the locale command:
  • locale ... list the current locale configuration
  • locale -a ... lists all all locales that were generated on your system
  • locale -a -v ... list all locales and show useful additional information (such as directory names that contain the locale information data files)
The last command from above makes you see that all generated locales are located in /usr/lib/locale/, you may remove any of them if unneeded. Each pack of locale information is a directory containing text files and other directories.

Supported locales
All locales that you want your system to support are listed in the text files in /var/lib/locales/supported.d/. These files have two columns, language tag and character map.
I want my system to know US-English only, so I have only one file there, called en, which contains just a single line:
Code:
en_US UTF-8
Error messages
If error messages are displayed when issuing the locale command, e.g.
Code:
locale: Cannot set LC_ALL to default locale: No such file or directory
make sure the file /etc/default/locale exists and has proper content, such as:
Code:
LANG="en_US"
LANGUAGE="en_US:en"
Get rid of unneeded locale data - Step by step
Now we know all the necessary details to get started with cleaning up our system's locale information:
  1. Edit the locale file(s) in /var/lib/locales/supported.d/, and remove all unneeded locales (one locale per line)
  2. Create and edit /etc/default/locale (see above for an example)
  3. Delete all generated locale data: rm -rfv /usr/lib/locale/*
  4. Re-generate new locales: locale-gen

That's all! Reboot your machine to make your changes take effect. Then run one or more of the locale command examples from above to ensure yourself that the result is as expected.
Code:
~# 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=
~# 
~# locale -a -v
locale: en_US.utf8      directory: /usr/lib/locale/en_US.utf8
-------------------------------------------------------------------------------
    title | English locale for the USA
   source | Free Software Foundation, Inc.
  address | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
    email | bug-glibc-locales@gnu.org
 language | English
territory | USA
 revision | 1.0
     date | 2000-06-24
  codeset | UTF-8
There is a package for Debian/Ubuntu that can take care of removing locales and locale related files (e.g. man pages): localepurge. You can install/run it issueing:
Code:
sudo apt-get install localepurge
Read the man page before using it, though. If you can get your stuff done without it it's probably safer to let go.

References
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