/usr/share/language-tools/update-langlist is in accountsservice 0.6.45-1ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | #!/bin/sh -e
#
# update-langlist maintains the LANGUAGE priority list. It does so in
# a simplified manner, unlike the UI in language-selector-gnome for
# setting the user language which provides full control.
first_language=$1
homedir=$2
renewed_langlist=
[ -n "$first_language" -a -n "$homedir" ] || exit 1
get_old_langlist() {
if [ -r "$homedir/.pam_environment" ]; then
while read line; do
if [ "$( echo "${line%=*}" | sed -r 's/\s+DEFAULT$//' )" = 'LANGUAGE' ]; then
old_langlist=${line#*=}
break
fi
done < $homedir/.pam_environment
fi
}
old_langlist=
english=true
if [ ${first_language%%[_@]*} != 'en' ]; then
get_old_langlist
english=false
fi
if [ -n "$old_langlist" ] && ! $english; then
if expr $old_langlist : ".*:$first_language:" > /dev/null ; then
renewed_langlist=$( echo $old_langlist | sed -r "s/(.+:)($first_language:)/\2\1/" )
elif [ ${old_langlist%%:*} = $first_language ]; then
# no change
renewed_langlist=$old_langlist
else
renewed_langlist=$first_language:$old_langlist
fi
else
# build fresh list with 'en' as the last element
# no other languages needed if English was selected
renewed_langlist=$first_language
[ $first_language != 'en' ] && renewed_langlist=$renewed_langlist:en
fi
echo $renewed_langlist
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