问一个关于 https 证书的 certbot 的问题

根据官网教程 https://certbot.eff.org/lets-encrypt/ubuntuxenial-nginx 安装必须软件后

执行 $ sudo certbot --nginx 后报错：

Saving debug log to /var/log/letsencrypt/letsencrypt.log
An unexpected error occurred:
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe6 in position 44: ordinal not in range(128)
Please see the logfiles in /var/log/letsencrypt for more details.

报错文件的内容是：

2018-03-17 13:06:34,407:DEBUG:certbot.main:certbot version: 0.21.1
2018-03-17 13:06:34,408:DEBUG:certbot.main:Arguments: []
2018-03-17 13:06:34,408:DEBUG:certbot.main:Discovered plugins: PluginsRegistry(PluginEntryPoint#manual,PluginEntryPoint#nginx,PluginEntryPoint#null,PluginEntryPoint#standalone,PluginEntryPoint#webroot)
2018-03-17 13:06:34,417:DEBUG:certbot.log:Root logging level set at 20
2018-03-17 13:06:34,418:INFO:certbot.log:Saving debug log to /var/log/letsencrypt/letsencrypt.log
2018-03-17 13:06:34,419:DEBUG:certbot.plugins.selection:Requested authenticator None and installer None
2018-03-17 13:06:34,731:DEBUG:certbot.log:Exiting abnormally:
Traceback (most recent call last):
  File "/usr/bin/certbot", line 11, in <module>
    load_entry_point('certbot==0.21.1', 'console_scripts', 'certbot')()
  File "/usr/lib/python3/dist-packages/certbot/main.py", line 1240, in main
    return config.func(config, plugins)
  File "/usr/lib/python3/dist-packages/certbot/main.py", line 1099, in certonly
    installer, auth = plug_sel.choose_configurator_plugins(config, plugins, "certonly")
  File "/usr/lib/python3/dist-packages/certbot/plugins/selection.py", line 194, in choose_configurator_plugins
    authenticator = pick_authenticator(config, req_auth, plugins)
  File "/usr/lib/python3/dist-packages/certbot/plugins/selection.py", line 40, in pick_authenticator
    config, default, plugins, question, (interfaces.IAuthenticator,))
  File "/usr/lib/python3/dist-packages/certbot/plugins/selection.py", line 77, in pick_plugin
    verified.prepare()
  File "/usr/lib/python3/dist-packages/certbot/plugins/disco.py", line 248, in prepare
    return [plugin_ep.prepare() for plugin_ep in six.itervalues(self._plugins)]
  File "/usr/lib/python3/dist-packages/certbot/plugins/disco.py", line 248, in <listcomp>
    return [plugin_ep.prepare() for plugin_ep in six.itervalues(self._plugins)]
  File "/usr/lib/python3/dist-packages/certbot/plugins/disco.py", line 130, in prepare
    self._initialized.prepare()
  File "/usr/lib/python3/dist-packages/certbot_nginx/configurator.py", line 131, in prepare
    self.parser = parser.NginxParser(self.conf('server-root'))
  File "/usr/lib/python3/dist-packages/certbot_nginx/parser.py", line 38, in __init__
    self.load()
  File "/usr/lib/python3/dist-packages/certbot_nginx/parser.py", line 45, in load
    self._parse_recursively(self.config_root)
  File "/usr/lib/python3/dist-packages/certbot_nginx/parser.py", line 66, in _parse_recursively
    self._parse_recursively(subentry[1])
  File "/usr/lib/python3/dist-packages/certbot_nginx/parser.py", line 56, in _parse_recursively
    trees = self._parse_files(filepath)
  File "/usr/lib/python3/dist-packages/certbot_nginx/parser.py", line 206, in _parse_files
    parsed = nginxparser.load(_file)
  File "/usr/lib/python3/dist-packages/certbot_nginx/nginxparser.py", line 123, in load
    return loads(_file.read())
  File "/usr/lib/python3.5/encodings/ascii.py", line 26, in decode
    return codecs.ascii_decode(input, self.errors)[0]
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe6 in position 44: ordinal not in range(128)

服务器是 ubuntu 16.04 nginx