PDF Header not printing in Ubuntu 16 Erpnext v9

[revant_one]

I faced similar issue on Debian Stretch.

Installing libssl1.0-dev solved it for me.

Problem print to pdf

For Debian Stretch users and others with the QSslSocket: cannot resolve $func issue, you just need to install the package libssl1.0-dev (or similar package in your distro). https://github.com/wkhtmltopdf/wkhtmltopdf/issues/3001#issuecomment-309673453