preinst is in gwibber 3.4.0-0ubuntu4.
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 -e
case $1 in
upgrade)
if dpkg --compare-versions "$2" lt "3.1.4+r1093-0ubuntu2"; then
touch /var/lib/pycentral/gwibber.pkgremove || true
fi
;;
esac
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