postinst is in initramfs-tools-core 0.122ubuntu8.
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 | #!/bin/sh
set -e
if [ ! -e /etc/initramfs-tools/modules ]; then
sed '/^###/d' /usr/share/initramfs-tools/modules \
> /etc/initramfs-tools/modules
fi
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