postinst is in accountsservice 0.6.15-2ubuntu9.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
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set -e
get_pid() {
    [ -n "$1" ] || return 0
    [ -S /var/run/dbus/system_bus_socket ] || return 0
    dbus-send --system --dest=org.freedesktop.DBus --print-reply \
              /org/freedesktop/DBus org.freedesktop.DBus.GetConnectionUnixProcessID \
              string:$1 2>/dev/null | awk '/uint32/ {print $2}'
}
if [ "$1" = "configure" ]; then
   # stop accounts-daemon
   pid=$(get_pid org.freedesktop.Accounts)
   kill $pid 2>/dev/null || true
   # restart daemon if it was running before
   [ -z "$pid" ] || /usr/lib/accountsservice/accounts-daemon & >/dev/null || true # will trigger through D-Bus activation
fi
#
# Modify /etc/default/locale and /etc/environment due to a changed
# meaning in Ubuntu 12.04 of the LANG environment variable. LANG
# now represents the display language instead of regional formats.
#
LANG_definition_migration() {
    unset LANG LC_MESSAGES
    test -f /etc/default/locale && . /etc/default/locale
    test -n "$LC_MESSAGES" || return 0
    config_files='/etc/default/locale /etc/environment'
    update() {
        # if that file doesn't define a locale, skip it
        grep -q "^LANG=" $f || return 0
        f=$1; var=$2; value=$3
        if grep -q "^$var=" $f; then
            sed -i "s/^$var=.*/$var=\"$value\"/" $f
        else
            echo "$var=\"$value\"" >> $f
        fi
    }
    if [ -n "$LANG" ] && [ $LANG != ${LANG%.utf8*} ]; then
        LANG=${LANG%.*}.UTF-8${LANG#*.utf8}
    fi
    if [ $LC_MESSAGES != ${LC_MESSAGES%.utf8*} ]; then
        LC_MESSAGES=${LC_MESSAGES%.*}.UTF-8${LC_MESSAGES#*.utf8}
    fi
    for f in $config_files; do
        test -f "$f" || continue
        update $f 'LANG' $LC_MESSAGES
    done
    if [ -n "$LANG" ] && [ $LANG != $LC_MESSAGES ]; then
        for f in $config_files; do
            test -f "$f" || continue
            for var in 'LC_NUMERIC' 'LC_TIME' 'LC_MONETARY' 'LC_PAPER' 'LC_NAME' \
                       'LC_ADDRESS' 'LC_TELEPHONE' 'LC_MEASUREMENT' 'LC_IDENTIFICATION'; do
                update $f $var $LANG
            done
        done
    fi
    for f in $config_files; do
        test -f "$f" || continue
        for var in 'LC_MESSAGES' 'LC_CTYPE' 'LC_COLLATE'; do
            sed -i "/^$var=\"[^[:space:]]*\"$/d" $f
        done
    done
}
if dpkg --compare-versions "$2" lt-nl 0.6.15-2ubuntu9; then
    LANG_definition_migration
fi
 |