preinst is in prism2-usb-firmware-installer 0.2.9+dfsg-4.
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 | #!/bin/sh -e
# Clean up after 0.2.9+dfsg-3 which used /var/lib
if [ "$1" = "upgrade" -a "$2" = "0.2.9+dfsg-3" ]; then
rm -rf /var/lib/prism2-usb-firmware-installer
fi
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