/usr/lib/debug/.build-id/b1/ is in gdb-dbg 7.11-0ubuntu1.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/debug/.build-id/b1/0e0a3527d22ca28277646a3edde828e7a54a12.debug
    
 | application/x-executable | root:root | 0o644 | 11.3 MB |