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

How to Install GKSu on Debian Gnu/Linux Distro

GNU/Linux Debian Installing GKSu Guide

Hi! The Tutorial shows you Step-by-Step How Emulate GKSu in Debian GNU/Linux Desktops.

And GKSu for Debian is a Library that provides a Gtk+ Frontend to su and sudo.

Moreover, it supports login shells and preserving environment when acting as a su frontend. It is useful to Menu items or other Graphical Programs that need to ask a user’s Password to run another Program as another User.

Especially relevant: GKSu is NOT ANYMORE AVAILABLE, it has been definitively removed from Repos for SECURITY ISSUES concerns.

So see instead the: GKSu Alternative Pkexec.

How to Install GKSu in Debian Linux - Featured

GNU/Linux Debian GKSu Installation Guide