Required Packages Setup
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2. Installing DependenciesInstall Required Package (Only for 64-bit): sudo apt install libxml2:i386 Authenticate with the User Admin Pass. 
 If Got “User is Not in Sudoers file” then see: How to Enable sudo
Contents
$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }
Install Required Package (Only for 64-bit):
sudo apt install libxml2:i386
Authenticate with the User Admin Pass.
If Got “User is Not in Sudoers file” then see: How to Enable sudo