/usr/lib/debug/.build-id/b1/ 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/b1/24ece525d30578d31628fdab9dad42998e7ccc.debug
    
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    /usr/lib/debug/.build-id/b1/cf2d215669c5c8b999b6dce39032bdaba010d0.debug
    
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                application/x-executable | root:root | 0o644 | 301.4 KB |