$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }

Troubleshooting Canon Printer Driver Installation on Gnu/Linux Distros

GNU+Linux Canon Legacy Driver Installation Troubleshooting Guide

The Linked Tutorial shows you Step-by-Step How to Solve the Canon Printer Legacy Driver Installation Issues on GNU/Linux Desktops.

This mostly because in origin some Canon Driver has been conceived some Times ago.

Canon Printer Driver Installation Troubleshooting for Linux - Featured