postinst is in samba-common-bin 2:4.3.11+dfsg-0ubuntu0.16.04.18.
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 11 12 13 14 15 16 | #!/bin/sh
set -e
if dpkg --compare-versions "$2" lt-nl 2:4.0.12+dfsg-2~; then
for alternative in nmblookup net testparm; do
if update-alternatives --list $alternative >/dev/null 2>&1
then
update-alternatives --remove-all $alternative
fi
done
fi
exit 0
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