为什么无法在语言环境中设置 LC_ALL 的值？

Question

我本地电脑上的操作系统。

uname -a
Linux debian 4.9.0-11-amd64 #1 SMP Debian 4.9.189-3 (2019-09-02) x86_64 GNU/Linux

我当前的语言环境。

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=

我想设置LC_ALL=C.UTF-8.

sudo localectl set-locale LC_ALL=C.UTF-8
Failed to issue method call: Invalid Locale data.

尝试设置一下 LC_ALL=en_US.UTF-8。

sudo localectl set-locale  LC_ALL=en_US.UTF-8 
Failed to issue method call: Invalid Locale data.

默认值LC_ALL只能为空（空）？

Answer 1

如 Arch Linux wiki Locale,LC_ALL: Troubleshooting中所述：

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LC_ALL is the only LC_* variable which cannot be set in locale.conf files: it is meant to be used only for testing or troubleshooting purposes, for example in /etc/profile.\n

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在locale.conf \xe2\x80\x94 区域设置的配置文件中，systemd 文档中指出：

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Note that LC_ALL may not be configured in this file.\n

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