This file is indexed.

/usr/lib/ubiquity/compat/udpkg is in ubiquity 2.21.63.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#! /bin/sh
# Some scripts use this to figure out the architecture. In ubiquity, just
# call dpkg instead, except that --print-os needs a bit of special-casing.
if [ "$1" = --print-os ]; then
    # TODO: hardcoded for now
    echo linux
elif [ "$1" = -c ]; then
    # udpkg -c has simpler output than dpkg -c.
    dpkg --fsys-tarfile "$2" | tar t
else
    exec dpkg "$@"
fi