man: can’t set the locale; make sure $LC_* and $LANG are correct

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这个是语言设置的问题，通过 locale-gen 可以解决。

首先编辑文件 /etc/locale.gen， 最好添加 en_US.UTF-8 UTF-8 ，其的注释掉

然后执行 

 locale-gen
Generating locales (this might take a while)...
  en_US.UTF-8... done
Generation complete.

locale-gen

LOCALE-GEN(8)               System Manager's Manual              LOCALE-GEN(8)

NAME
       locale-gen — generates localisation files from templates

SYNOPSIS
       locale-gen

DESCRIPTION
       This manual page documents briefly the locale-gen command.

       By  default, the locale package which provides the base support for lo‐
       calisation of libc-based programs does not contain usable  localisation
       files  for  every supported language. This limitation has became neces‐
       sary because of the substantial size of such files and the large number
       of  languages  supported  by  libc.  As a result, Debian uses a special
       mechanism where we prepare the actual localisation files on the  target
       host and distribute only the templates for them.

       locale-gen is a program that reads the file /etc/locale.gen and invokes
       localedef for the chosen localisation profiles.  Run  locale-gen  after
       you have modified the /etc/locale.gen file.

FILES
       /etc/locale.gen

       The main configuration file, which has a simple format: every line that
       is not empty and does not begin with a # is treated as a locale defini‐
       tion that is to be built.

SEE ALSO
       localedef(1), locale(1), locale.gen(5).

AUTHOR
       This manual page was written by Eduard Bloch <blade@debian.org> for the
       Debian GNU/Linux system (but may be used  by  others).   Permission  is
       granted to copy, distribute and/or modify this document under the terms
       of the GNU Free Documentation License, Version 1.1 or any later version
       published  by the Free Software Foundation; with no Invariant Sections,
       no Front-Cover Texts and no Back-Cover Texts.

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