我正在开发一个 Django 项目，我们从 HTML 模板生成 PDF 文件。我django-pdfkit用来渲染PDF。
我的Ubuntu 16.04一切正常，但是当我在 DigitalOcean Ubuntu 16.04 服务器上部署项目时，它会引发错误：
/render/doklad/wkhtmltopdf 处的 IOError 以非零代码 -6 退出。错误：
QXcbConnection：无法连接到显示器
我试图安装
sudo apt-get install libxrender1 fontconfig xvfb
将WKHTMLTOPDF_BIN变量设置为正确的路径。
将用户更改gunicorn为root。
pip install wkhtmltopdf
没有任何帮助，你知道我能做些什么来解决这个问题吗？
编辑：
我发现如果我以 root 身份执行此命令，它可以正常工作：
wkhtmltopdf http://www.google.com google.pdf
但问题是如果我使用djangouser. 它返回相同的东西：
QXcbConnection: Could not connect to display
Aborted (core dumped)
所以我试图改变gunicorn.service，所以 gunicorn 正在运行root而不是django但它没有帮助。
http://mypage/render/doklad/?id=1
返回相同的错误。
此文件中似乎出现了错误：
https://github.com/JazzCore/python-pdfkit/blob/master/pdfkit/pdfkit.py
这是一个回溯：
Aug 25 04:42:46 homeit-generator-faktur-beta gunicorn[29032]: - - [25/Aug/2017:04:42:46 +0000] "GET / HTTP/1.0" 302 - "-" "Mozilla/5.0"
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: Internal Server Error: /render/doklad/
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: Traceback (most recent call last):
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: File "/home/django/homeit/homeitvenv/local/lib/python2.7/site-packages/django/cor
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: response = get_response(request)
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: File "/home/django/homeit/homeitvenv/local/lib/python2.7/site-packages/django/cor
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: response = self.process_exception_by_middleware(e, request)
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: File "/home/django/homeit/homeitvenv/local/lib/python2.7/site-packages/django/cor
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: response = wrapped_callback(request, *callback_args, **callback_kwargs)
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: File "/home/django/homeit/homeitvenv/local/lib/python2.7/site-packages/django/vie
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: return self.dispatch(request, *args, **kwargs)
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: File "/home/django/homeit/homeitvenv/local/lib/python2.7/site-packages/django/vie
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: return handler(request, *args, **kwargs)
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: File "/home/django/homeit/dashboard/views.py", line 186, in get
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: return super(DokladToPdf, self).get(*args, **kwargs)
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: File "/home/django/homeit/homeitvenv/local/lib/python2.7/site-packages/django_pd
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: content = self.render_pdf(*args, **kwargs)
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: File "/home/django/homeit/homeitvenv/local/lib/python2.7/site-packages/django_pd
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: pdf = pdfkit.from_string(html, False, options, **kwargs)
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: File "/home/django/homeit/homeitvenv/local/lib/python2.7/site-packages/pdfkit/ap
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: return r.to_pdf(output_path)
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: File "/home/django/homeit/homeitvenv/local/lib/python2.7/site-packages/pdfkit/pd
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: raise IOError("wkhtmltopdf exited with non-zero code {0}. error:\n{1}".format(
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: IOError: wkhtmltopdf exited with non-zero code -6. error:
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: QXcbConnection: Could not connect to display
Aug 25 06:05:55 homeit-generator-faktur-beta gunicorn[29032]: - - [25/Aug/2017:06:05:55 +0000] "GET /render/doklad/?id=1 HTTP/1.0" 500 108058 "