/usr/share/compiz/cubeaddon/images/ is in compiz-plugins 1:0.9.13.1+18.04.20180302-0ubuntu1.
This file is owned by root:root, with mode 0o755.
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    /usr/share/compiz/cubeaddon/images/compizcap.png
    
 | image/png | root:root | 0o644 | 67.7 KB | 
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    /usr/share/compiz/cubeaddon/images/cubecap_release.png
    
 | image/png | root:root | 0o644 | 488.0 KB | 
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    /usr/share/compiz/cubeaddon/images/fusioncap.png
    
 | image/png | root:root | 0o644 | 133.6 KB |