preinst is in libpam-modules 1.1.3-7ubuntu2.
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 11 12 13 14 | #!/bin/sh
set -e
. /usr/share/debconf/confmodule
if dpkg --compare-versions "$2" lt-nl 1.1.3-2; then
db_version 2.0
if pidof xscreensaver xlockmore >/dev/null; then
db_input critical libpam-modules/disable-screensaver || true
db_go || true
fi
fi
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