debian change system language

1. select locales:

2. set language:

 sudo localectl set-locale LANG=zh_CN.utf8
 sudo localectl set-locale LANGUAGE=zh_CN.utf8
 sudo localectl set-locale LC_ALL=zh_CN.utf8

3. sudo reboot

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centos默认已经选择了很多locales，直接执行步骤2就可以了。