wkhtmltopdf - QXcbConnection: Could not connect to display

There is a more easy way to make John WH Smith solution.

Just install xvfb from apt and then, you can run:

xvfb-run wkhtmltopdf

(just put xvfb-run before any wkhtmltopdf command.)

This is a bug, and the fix hasn't been brought to the Debian repositories. Quoting ashkulz (who closed the bug report) :

You're using the version of wkhtmltopdf in the debian repositories, which does not support running headless.

So you can either...

Download wkhtmltopdf from source and compile it (see the instructions in the INSTALL.md file ; you may remove the --recursive option from their git clone line, if you already have Qt 4.8 installed).
Run it inside xvfb, as suggested by masterkorp in the bug report.

on your command line type like this

export DISPLAY=:0

then run your qt applications

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