/usr/bin/nuweb2noweb is in noweb 2.11b-7.1ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #!/bin/sh
# convert nuweb to noweb
LIB=/usr/lib/noweb
$LIB/numarkup "$@" | $LIB/unmarkup
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