/usr/lib/coq/plugins/setoid_ring/ is in libcoq-ocaml-dev 8.4pl4dfsg-1.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/coq/plugins/setoid_ring/newring.cmi
    
 | application/octet-stream | root:root | 0o644 | 27.6 KB | 
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    /usr/lib/coq/plugins/setoid_ring/newring_plugin_mod.cmi
    
 | application/octet-stream | root:root | 0o644 | 2.0 KB |