/usr/share/debhelper/autoscripts/postinst-wm-noman is in debhelper 9.20120115ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | if [ "$1" = "configure" ]; then
update-alternatives --install /usr/bin/x-window-manager \
x-window-manager #WM# #PRIORITY#
fi
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