/usr/lib/debug/.build-id/8b/ is in qtbase5-examples-dbg 5.2.1+dfsg-1ubuntu14.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/debug/.build-id/8b/229df3d8a125df1b300307725e4e67a8d103d7.debug
    
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                application/x-executable | root:root | 0o644 | 423.6 KB | 
                    
    
    
    /usr/lib/debug/.build-id/8b/cca3d441e6649b1fc935da1cd020ea80da6d2c.debug
    
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                application/x-executable | root:root | 0o644 | 556.0 KB |