/usr/share/apt-setup/release-files/archive.ubuntu.com/xenial-updates/ is in ubiquity 18.04.14.
This file is owned by root:root, with mode 0o755.
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    /usr/share/apt-setup/release-files/archive.ubuntu.com/xenial-updates/Release
    
        
    
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    /usr/share/apt-setup/release-files/archive.ubuntu.com/xenial-updates/Release.gpg
    
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                application/pgp-signature | root:root | 0o644 | 933 bytes |