* http://www.tldp.org/HOWTO/Francophones-HOWTO.html
  * http://www.us.debian.org/doc/manuals/intro-i18n/
  * http://www.us.debian.org/doc/manuals/debian-euro-support/index.fr.html


  TERM=vt100
  LANG=en_US
  LANGUAGE=C
  LC_COLLATE=C
  LESSCHARSET=latin1


  $ hexdump /tmp/eacute
  0000000 00e9
  0000001

==== OS ====

[[Debian]]

  sudo dpkg-reconfigure locales
  sudo dpkg-reconfigure localepurge || sudo apt-get install localepurge


  * http://www.us.debian.org/doc/manuals/debian-euro-support/ch-configure.fr.html#s3.3.3

  dpkg -L language-env || sudo apt-get install language-env

  sudo dpkg-reconfigure console-data


  sudo apt-get install  localepurge  console-setup xfonts-intl-european console-terminus

<code>
grep = /etc/default/locale

LANG=en_US.UTF-8
LC_ADDRESS=fr_FR.UTF-8
LC_IDENTIFICATION=fr_FR.UTF-8
LC_MEASUREMENT=fr_FR.UTF-8
LC_MONETARY=fr_FR.UTF-8
LC_NAME=fr_FR.UTF-8
LC_NUMERIC=fr_FR.UTF-8
LC_PAPER=fr_FR.UTF-8
LC_TELEPHONE=fr_FR.UTF-8
LC_TIME=fr_FR.UTF-8

sudo sed -e 's|fr_FR|eu_US|g' -i /etc/default/locale
</code>

  cat  /etc/environment
  LANGUAGE="fr_FR:fr:en_GB:en"
  LANG=fr_FR@euro


===== ERROR =====

==== ERROR / BASH ====
==== usage ====

  sudo dpkg-reconfigure locales || apt-get install locales dialog # Enable $LANG should be enough ?
  
==== LC_ALL ====

=== LC_ALL unset ? ===

Q:
  "locale: Cannot set LC_ALL to default locale: No such file or directory "

A:

  echo $LC_ALL | grep LC_ALL || { echo "LC_ALL=en_US.UTF-8"  | sudo tee -a /etc/environment ; }

  https://unix.stackexchange.com/questions/676897/debian-11-issue-with-locale-no-such-file-or-directory


==== bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8): No such file or directory ====
  
  cat /etc/environment 
  cp -av /etc/environment /etc/environment._$(date +%s).bak
  
  . /etc/environment
  echo "LC_ALL=${LC_ALL}" # LC_ALL=en_US.UTF-8
  sudo dpkg-reconfigure locales || apt-get install locales dialog # Enable $LANG should be enough ?

  . /etc/environment
  bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)

  echo "LANG=$LANG" && sudo locale-gen $LANG
  bash 
  . /etc/environment
  
Ok on debian:10

==== /bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8) ====

  echo "LANG=$LANG"
  fr_FR.UTF-8
  sudo dpkg-reconfigure locales  # Enable $LANG should be enough ?

  sudo locale-gen $LANG

  grep -v '^#'  /etc/locale.gen
  en_US ISO-8859-1
  en_US.ISO-8859-15 ISO-8859-15
  en_US.UTF-8 UTF-8


  cat /etc/locale.conf

==== /bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8) ====

  echo "# LC_ALL=${LC_ALL}"
  echo "# LC_CTYPE=${LC_CTYPE}"
  sudo time locale-gen "${LC_ALL}"
  sudo time update-locale "${LC_CTYPE}"
  sudo time dpkg-reconfigure locales  # Enable $LANG should be enough ?

  * https://askubuntu.com/questions/114759/warning-setlocale-lc-all-cannot-change-locale  

==== Q: perl: warning: Falling back to the standard locale ("C"). ====

  perl: warning: Falling back to the standard locale ("C").
  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

  sudo dpkg-reconfigure locales  # Enable $LANG should be enough ?
==== Q: perl: warning: Please check that your locale settings: ====

  perl: warning: Please check that your locale settings:
        LANGUAGE = (unset),
        LC_ALL = (unset),
        LC_CTYPE = "en_US.UTF8",
        LANG = "C"

Observe

  cat /etc/environment # was empty

Try:

  sudo zile /etc/environment
  LC_ALL=en_US.UTF-8
  LANG=en_US.UTF-8
  
  
=== Q: ===

  perl: warning: Setting locale failed.
  perl: warning: Please check that your locale settings:
        LANGUAGE = "",
        LC_ALL = (unset),

A:

  sudo dpkg-reconfigure localepurge

Q:
  Please use a locale setting which supports UTF-8 (such as LANG=en_US.UTF-8).

A: ?
  echo "LANG=$LANG" ;  export LANG=en_US.UTF-8
  
  cat /etc/environment
  LC_ALL=en_US.UTF-8
  LANG=en_US.UTF-8

Q: 
<code>
update-locale: Error: invalid locale settings: \
LC_PAPER=eu_US.UTF-8
LC_IDENTIFICATION=eu_US.UTF-8
LC_NAME=eu_US.UTF-8
LC_NUMERIC=eu_US.UTF-8
LC_TIME=eu_US.UTF-8
LC_MEASUREMENT=eu_US.UTF-8
LC_ADDRESS=eu_US.UTF-8
LC_MONETARY=eu_US.UTF-8
LANG=en_US.UTF-8
LC_TELEPHONE=eu_US.UTF-8
</code>


==== mosh : ====

<code>

mosh-server needs a UTF-8 native locale to run.

# @ target:

locale
#| LANG=


A:

sudo dpkg-reconfigure locales # en_US.UTF-8 or C.UTF-8 ?
locale
#| LANG=en_US.UTF-8
</code>


==== locale: Cannot set LC_CTYPE to default locale: No such file or directory ====

  echo $LC_CTYPE
  en_US

  sudo dpkg-reconfigure locales # en_US.UTF-8 or C.UTF-8 ?
  sudo locale-gen


  * https://askubuntu.com/questions/599808/cannot-set-lc-ctype-to-default-locale-no-such-file-or-directory


===== update-locale =====

  * https://wiki.debian.org/ChangeLanguage

<code>
cat /etc/default/locale
#  File generated by update-locale
LANGUAGE=fr_FR.UTF-8
LANG=en_US.UTF-8
LC_MESSAGES=fr_FR.UTF-8
LC=fr_FR.UTF-8

root@arm:~# sed -e 's|fr_FR|en_US|g' -i /etc/default/locale
root@arm:~# . /etc/default/locale
root@arm:~# update-locale 

</code>


===== error :  Unable to read environment locale: =====

<code>

    # perl: warning: Falling back to the standard locale ("C").
    # Running mktexlsr /var/lib/texmf ... done.
    # Unable to read environment locale: exit now.
   
    dpkg --configure -a

   Running mktexlsr /var/lib/texmf ... done.
Building format(s) --all.
        This may take some time... 
fmtutil failed. Output has been stored in
/tmp/fmtutil.KEPHhSCp
Please include this file if you report a bug.

dpkg: error processing package tex-common (--configure):
</code>

===== LINKS =====

   * https://askubuntu.com/questions/410048/utf-8-character-not-showing-properly-in-tmux# 


===== MORE =====

@TaG: [[World]] [[French]]