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

How to Install Mesa Driver on Mint Gnu/Linux Distro

GNU/Linux Mint Installing MESA Guide

Hi! The linked Tutorials Show you Step-by-Step How to Install the Latest MESA Drivers in Mint GNU/Linux Desktops.

And MESA for Mint, also called Mesa3D, originally was an Open-Source Device Driver and Software Implementation of the OpenGL, Vulkan, OpenGL ES, OpenCL, and others API specifications.
What is MESA now? Currently the Mesa Project is a solution to encompass the different Open Source Graphics Drivers (AMD/RADEON, INTEL) available on Linux and power directly the GPU!

How to Install the Latest MESA Drivers on Linux Mint - Featured

GNU/Linux Mint MESA Drivers Installation Guide