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

How to Edit Grub Menu Entries with GUI on GNU/Linux Distros

GNU/Linux Editing Grub Menu Entries GUI Guide

Hi! This tutorial will guide you step-by-step on How to Edit Grub Menu Entries Easily with GUI in GNU/Linux Desktops.

And this Guide make use of Grub Customizer, a useful UI Tool for changing the Settings of the GRUB boot loader.

Finally, you may be also interested to see: How to Change Default OS.

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GNU/Linux Edit GRUB Menu Entries with GUI Guide