/usr/lib/debug/.build-id/91/ is in kdelibs5-dbg 4:4.14.16-0ubuntu3.
This file is owned by root:root, with mode 0o755.
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    /usr/lib/debug/.build-id/91/09cf8f01b2db0808de77b13c11b5dbb5abf761.debug
    
 | application/x-sharedlib | root:root | 0o644 | 11.0 MB | 
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    /usr/lib/debug/.build-id/91/4e62a700595906bcd69d0341c61dd602c169fb.debug
    
 | application/x-sharedlib | root:root | 0o644 | 36.5 MB | 
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    /usr/lib/debug/.build-id/91/7a0f33deb9e9aa6d90905adc72d63b1d03f4b6.debug
    
 | application/x-sharedlib | root:root | 0o644 | 385.4 KB |