Certbot: 0.9.1 在非交互使用中失败（pythondialog，错误打开终端）

使用自动更新脚本的 Debian8 自动更新框，我有一个 shell 脚本 + cronjob 来更新我的证书 @weekly
10 月 2 日成功运行，10 月 9 日更新 0.8.1 -> 0.9.1 并死亡。

Upgrading certbot-auto 0.8.1 to 0.9.1...
Replacing certbot-auto...
Creating virtual environment...
Installing Python packages...
Installation succeeded.
An unexpected error occurred:
Bug in pythondialog: expected an empty output from u'infobox', but got: u'Error opening terminal: unknown.\n'Please see the logfile 'certbot.log' for more details.

日志文件输出：

2016-10-15 21:01:18,381:DEBUG:certbot.main:Root logging level set at 20
2016-10-15 21:01:18,420:DEBUG:certbot.main:Exiting abnormally:
Traceback (most recent call last):
  File "/root/.local/share/letsencrypt/bin/letsencrypt", line 11, in <module>
    sys.exit(main())
  File "/root/.local/share/letsencrypt/local/lib/python2.7/site-packages/certbot/main.py", line 749, in main
    setup_logging(config)
  File "/root/.local/share/letsencrypt/local/lib/python2.7/site-packages/certbot/main.py", line 653, in setup_logging
    logger.info("Saving debug log to %s", log_file_path)
  File "/usr/lib/python2.7/logging/__init__.py", line 1160, in info
    self._log(INFO, msg, args, **kwargs)
  File "/usr/lib/python2.7/logging/__init__.py", line 1279, in _log
    self.handle(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 1289, in handle
    self.callHandlers(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 1329, in callHandlers
    hdlr.handle(record)
  File "/usr/lib/python2.7/logging/__init__.py", line 757, in handle
    self.emit(record)
  File "/root/.local/share/letsencrypt/local/lib/python2.7/site-packages/certbot/log.py", line 64, in emit
    self.width + self.PADDING_WIDTH)
  File "/root/.local/share/letsencrypt/local/lib/python2.7/site-packages/dialog.py", line 2675, in infobox
    kwargs)
  File "/root/.local/share/letsencrypt/local/lib/python2.7/site-packages/dialog.py", line 1765, in _widget_with_no_output
    widget_name, output))
PythonDialogBug

我的主机箱使用的是 Debian 提供的二进制包（0.8.1），所以它仍然可以使用，但是我的主机箱受到了打击，因为我之前实现了它（在 Debian 提供包之前） - 我想其他用户可能也会受到影响，但他们可能没有注意到。 我当然没有超过一个星期。

有问题的外壳脚本：

#!/bin/sh
/letsencrypt/letsencrypt-auto certonly --webroot --renew-by-default -w /var/www/git-ssl-proof/ -d git.nikomo.eu
systemctl reload nginx

我懒得真正解决这个问题，所以我打算切换到 Debian 软件包，但我认为其他人也可能会被这个问题所困扰。