opening up a pdf in AWS Cloud9 environment

Question

I am trying to run a Flask / Python / MySQL web app in Amazon AWS Cloud9, so I can make sure it works before I put it online. It works good, except for one thing. In one point in my application, a new tab opens up with a pdf conversion of a page. The pdf file is not static, it is generated using an html page. When I try to open up this page as a pdf in the virtual environment, it gives me an error:

OSError: wkhtmltopdf: cannot connect to X server

It suggests I go to a link for more information: https://github.com/JazzCore/python-pdfkit/wiki/Using-wkhtmltopdf-without-X-server

Then it starts off by saying I run these two commands:

apt-get install wkhtmltopdf

apt-get install xvfb

"apt-get" did not work when I tried to run it from the cloud9 terminal, so I used the command "sudo yum install whtmltopdf" instead. wkhtmltopdf was successful, and I have version 0.12.4 now installed. "sudo yum install xvfb" however, does not install anything.

Without being able to install xvfb, I cannot follow the next steps, which are executing the commands:

printf '#!/bin/bash\nxvfb-run -a --server-args="-screen 0, 1024x768x24" /usr/bin/wkhtmltopdf -q $*' > /usr/bin/wkhtmltopdf.sh

chmod a+x /usr/bin/wkhtmltopdf.sh ln -s /usr/bin/wkhtmltopdf.sh /usr/local/bin/wkhtmltopdf

wkhtmltopdf http://www.google.com output.pdf

So, my question is... how can I get this pdf tab to open?

This is the part of my app.py code that opens up a new tab with the pdf conversion ("pdfkit" has been imported)

        @app.route("/print", methods=["GET"])
        @login_required
        def printPDF():
                renderedPDF = render_template("print.html", signWidth=int(request.args['signWidth'].split("px")[0]), signHeight=request.args['signHeight'], rows=ast.literal_eval(request.args['rows']), rowStrings=ast.literal_eval(request.args['rowStrings']), lettersPile=request.args['lettersPile'], newMessage=request.args['newMessage'], lettersNeeded=ast.literal_eval(request.args['lettersNeeded']), lettersPulled=ast.literal_eval(request.args['lettersPulled']))
                pdf = pdfkit.from_string(renderedPDF, False)
        
                response = make_response(pdf)
                response.headers['Content-Type'] = 'application/pdf'
                response.headers['Content-Disposition'] = 'inline; filename=signChange.pdf'
        
                return response

Is there ay way I can get this "x server" to work, or is there another way to get my pdf opened in this app without causing any error?