/usr/lib/debug/.build-id/9b/ is in libfftw3-dbg 3.3.4-2ubuntu1.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/debug/.build-id/9b/7f043cc544381640c5d9b89ec66377cae05012.debug
    
 | application/x-executable | root:root | 0o644 | 37.7 KB |