/usr/lib/debug/.build-id/dd/ is in libnss3-dbg 2:3.15.4-1ubuntu7.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/debug/.build-id/dd/88cb9ef2fa3d82b192f024d7d293e4bc020574.debug
    
 | application/x-executable | root:root | 0o644 | 109.9 KB |