preinst is in brltty-x11 5.3.1-2ubuntu2.
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 | #!/bin/sh
set -e
dpkg-maintscript-helper rm_conffile /etc/brltty/brltty-xw.hlp \
4.3-1ubuntu3 -- "$@"
dpkg-maintscript-helper rm_conffile /etc/brltty/brltty-xw-all.hlp \
4.3-1ubuntu3 -- "$@"
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