preinst is in libplplot-lua 5.13.0+dfsg-6ubuntu2.
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 | #!/bin/sh
set -e
# Automatically added by dh_installdeb/10.10.5ubuntu1
dpkg-maintscript-helper symlink_to_dir /usr/share/doc/libplplot-lua libplplot12 5.13.0+dfsg-4~ -- "$@"
# End automatically added section
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