postinst is in linux-wlan-ng-firmware 0.2.9+dfsg-6.
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 | #!/bin/sh -e
# this is a stupid lintian issue.
. /usr/share/debconf/confmodule
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