[daily][archlinux] 本地字符乱码, 无法显示中文

一：

突然有一天，Konsole里边看见的中文文件名的文件，就变成了乱码。thunderbird存到本地的附件，文件名也变成了乱码。

在X下查看locale，内容如下： 手动设置了之后也不对。 但是在字符模式下就是正常的。

/home/tong [tong@T7] [16:24]
> locale   
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=mn_CN.UTF-8
LC_CTYPE=mn_CN.UTF-8
LC_NUMERIC="mn_CN.UTF-8"
LC_TIME="mn_CN.UTF-8"
LC_COLLATE="mn_CN.UTF-8"
LC_MONETARY="mn_CN.UTF-8"
LC_MESSAGES="mn_CN.UTF-8"
LC_PAPER="mn_CN.UTF-8"
LC_NAME="mn_CN.UTF-8"
LC_ADDRESS="mn_CN.UTF-8"
LC_TELEPHONE="mn_CN.UTF-8"
LC_MEASUREMENT="mn_CN.UTF-8"
LC_IDENTIFICATION="mn_CN.UTF-8"
LC_ALL=

/home/tong [tong@T7] [16:24]
> localectl set-locale LANG=en_US.UTF-8

/home/tong [tong@T7] [16:25]
> locale
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=mn_CN.UTF-8
LC_CTYPE=mn_CN.UTF-8
LC_NUMERIC="mn_CN.UTF-8"
LC_TIME="mn_CN.UTF-8"
LC_COLLATE="mn_CN.UTF-8"
LC_MONETARY="mn_CN.UTF-8"
LC_MESSAGES="mn_CN.UTF-8"
LC_PAPER="mn_CN.UTF-8"
LC_NAME="mn_CN.UTF-8"
LC_ADDRESS="mn_CN.UTF-8"
LC_TELEPHONE="mn_CN.UTF-8"
LC_MEASUREMENT="mn_CN.UTF-8"
LC_IDENTIFICATION="mn_CN.UTF-8"
LC_ALL=

locale的值。是在/etc/locale.conf中设置的。同时参见  systemd-firstboot 以及 systemd-localed.service . 

二：

很显然，通过这种现象，一定是X搞得鬼，然后发现了，我上次顺手改了这个配置：

改回去，又重新设吧设吧，就好了。。。。 

伟大的KDE，始终让人无法了解。。。