preinst is in apt-listchanges 3.10.
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 -e
set -e
hook=/etc/apt/apt.conf.d/20listchanges
test -f $hook.disabled && mv $hook.disabled $hook
exit 0
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