preinst is in auto-apt-proxy 8ubuntu2.
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 | #! /bin/sh
set -e
aptconf=/etc/apt/apt.conf.d/auto-apt-proxy.conf
if [ -e "$aptconf".disabled ]; then
mv "$aptconf".disabled "$aptconf"
fi
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