preinst is in python-matplotlib 1.1.1~rc1+git20120423-0ubuntu1.
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 | #!/bin/sh
# TODO: remove this file after releasing Squeeze
set -e
if [ "$1" = upgrade ]
then
if dpkg --compare-versions "$2" lt 0.98.5.3-1 ; then
pycentral pkgremove python-matplotlib
fi
fi
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