For those trying to figure out how to add this extra variable to the docker template, you need to go to 'advanced' view (slider in the upper-right corner) and then look for the 'Extra parameters' section and enter this in the field:
--security-opt seccomp=unconfined
Worked for me as well - calibre gui back up and running.
Many thanks for your post, Im new to Unraid and this got it working again.
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Many thanks for your post, Im new to Unraid and this got it working again.