/usr/share/backgrounds/ is in ubuntu-wallpapers 18.04.1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
| File | Mime Type | Owner | Mode | Size | 
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    ..
    
        
    
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    /usr/share/backgrounds/ubuntu-default-greyscale-wallpaper.png
    
        
    
 | root:root | 0o777 | ||
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    /usr/share/backgrounds/warty-final-ubuntu.png
    
 | image/png | root:root | 0o644 | 491.7 KB |