/usr/share/initramfs-tools/scripts/casper-premount/ is in lupin-casper 0.57.
This file is owned by root:root, with mode 0o755.
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    /usr/share/initramfs-tools/scripts/casper-premount/20iso_scan
    
        
    
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                text/x-shellscript | root:root | 0o755 | 1.1 KB | 
                    
    
        
    
    
    /usr/share/initramfs-tools/scripts/casper-premount/30custom_installation
    
        
    
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                text/x-shellscript | root:root | 0o755 | 3.3 KB |