`wget https://downloads.wkhtmltopdf.org/0.12/0.12.2.1/wkhtmltox-0.12.2.1_linux-trusty-amd64.deb` no longer available for download. We could consider to change to github.com repo as an alternative: `https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.2.1/wkhtmltox-0.12.2.1_linux-trusty-amd64.deb`