POSTIN

/bin/sh

# add supported usb scanners to /etc/hotplug/usb.usermap
/usr/sbin/update-usb.usermap || :

POSTUN

/bin/sh

if [ "$1" = 0 ]; then
    # remove supported usb scanners from /etc/hotplug/usb.usermap
    # if erasing the package not as part of a package update
    /usr/sbin/update-usb.usermap || :
fi