/usr/lib/cruft/explain/rubber is in cruft-common 0.9.34.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/dash
p='rubber'
set -e
dpkg-query --listfiles "${p}" | awk '$0~/\.py$/ {print $0"c\n" $0"o"}' | while read o; do if [ -e "$o" ]; then echo "$o"; fi; done
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