postinst is in gdm 3.18.3-0ubuntu2.
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 | #!/bin/sh
set -e
. /usr/share/debconf/confmodule
# Purge the old gdm dconf template
if [ "$1" = configure ] && dpkg --compare-versions "$2" lt-nl "3.18.0"; then
db_purge
fi
exit 0
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