preinst is in libnjb5 2.2.7~dfsg0-3ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #!/bin/sh
# preinst script for libnjb
set -e
dpkg-maintscript-helper rm_conffile /etc/udev/libnjb.rules -- "$@"
exit 0
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