SSH远程连接到Ubutun，添加账号时出现如下错误：

root@LePlanet:~# adduser lienZzzz
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:        
    LANGUAGE = (unset),        
    LC_ALL = (unset),        
    LC_CTYPE = "zh_CN.UTF-8",        
    LANG = "en_US.UTF-8"    
  are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

在Stack Overflow中发现如下帖子,发现是SSH连接时，远程主机的/etc/ssh/sshd_config的文件有如下设置：

# Allow client to pass locale environment variables
AcceptEnv LANG LC_*

远端会读取本地的语系配置，但远端支持语系里没有本地当前语系，所以出现上述错误。

本地语系：

zh_CN.UTF-8

远端配置：

root@LePlanet:~# locale
  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
  LANG=en_US.UTF-8
  LANGUAGE=
  LC_CTYPE=zh_CN.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=

远端支持语系

root@LePlanet:~# locale -a
locale: Cannot set LC_CTYPE to default 
locale: No such file or directory
  C
  C.UTF-8
  en_AG
  en_AG.utf8
  en_AU.utf8
  en_BW.utf8
  en_CA.utf8
  en_DK.utf8
  en_GB.utf8
  en_HK.utf8
  en_IE.utf8
  en_IN
  en_IN.utf8
  en_NG
  en_NG.utf8
  en_NZ.utf8
  en_PH.utf8
  en_SG.utf8
  en_US.utf8
  en_ZA.utf8
  en_ZM
  en_ZM.utf8
  en_ZW.utf8
  POSIX

所以，远端需下载 zh_CN.UTF-8

root@LePlanet:~# sudo locale-gen zh_CN.UTF-8
  Generating locales...  
  zh_CN.UTF-8... 
  doneGeneration complete.

再查看：

root@LePlanet:~# locale -a
  C
  C.UTF-8
  en_AG
  en_AG.utf8
  en_AU.utf8
  en_BW.utf8
  en_CA.utf8
  en_DK.utf8
   en_GB.utf8
  en_HK.utf8
  en_IE.utf8
  en_IN
  en_IN.utf8
  en_NG
  en_NG.utf8
  en_NZ.utf8
  en_PH.utf8
  en_SG.utf8
  en_US.utf8
  en_ZA.utf8
  en_ZM
  en_ZM.utf8
  en_ZW.utf8
  POSIX
  zh_CN.utf8

已经不报错：

root@LePlanet:~# locale
 LANG=en_US.UTF-8
 LANGUAGE=
 LC_CTYPE=zh_CN.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=

此外，可以用sudo locale-gen，更新语系至最新。