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

How to Update System on Mint Gnu/Linux Distro

GNU/Linux Mint Updating System Guide

The tutorial shows you step-by-step How to Update Packages & System on Mint GNU/Linux desktops – Step by step Tutorials.

And here I explain How to Update/Upgrade Mint easily on Command Line.

You may also be interested in learning How to Update/Upgrade Kernel.

How to Update Mint GNU/Linux Distro

GNU/Linux Mint System Update Guide