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

How to Install Gnome Tweaks on Ubuntu Gnu/Linux Distro

GNU/Linux Ubuntu Installing GNOME Tweaks Guide

Hi! The Tutorial shows you Step-by-Step How to Install GNOME Tweaks (formerly GNOME Tweak Tool) in Ubuntu GNU/Linux Desktops.

And Gnome Tweaks for Ubuntu is a Graphical interface for advanced GNOME 3+ Settings.

How to Install GNOME Tweaks on Ubuntu GNU/Linux - Featured

GNU/Linux Ubuntu GNOME Tweaks Installation Guide