Upgrading Packages
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2. Upgrading PackagesThen to Update Mint Software 
 Simply play:sudo apt upgrade Authenticate with the User Admin Pass. 
 If Got “User is Not in Sudoers file” then Look: Solution.
Contents
$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }