/usr/lib/debug/.build-id/b5/ is in libfontconfig1-dbg 2.11.0-6.3+deb8u1.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/debug/.build-id/b5/574c4ce7be664cf5c0b4c3b5f0af20da9f711f.debug
    
 | application/x-executable | root:root | 0o644 | 11.4 KB |