preinst is in python-uniconvertor 1.1.4-1ubuntu2.
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 | #!/bin/sh -e
if [ "$1" = upgrade ] && dpkg --compare-versions "$2" lt 1.1.4-1; then
pycentral pkgremove python-uniconvertor
fi
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