GNU/Linux Ubuntu 20.04 Remove DKMS Module Guide
How to Remove DKMS Kernel Module in Ubuntu 20.04 Focal LTS – Step by step Tutorial.
And to Uninstall Ubuntu 20.04 DKMS Module you have also to Delete the Phisical Directory manually.

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$schemamarkup = get_post_meta(get_the_ID(), 'schemamarkup', true); if(!empty($schemamarkup)) { echo $schemamarkup; }
How to Remove DKMS Kernel Module in Ubuntu 20.04 Focal LTS – Step by step Tutorial.
And to Uninstall Ubuntu 20.04 DKMS Module you have also to Delete the Phisical Directory manually.