postinst is in mutter 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
action="$1"
if [ "$action" = configure ]; then
# register the alternatives of x-window-manager manually
# because dh_installwm doesn't register manpage as slave yet.
update-alternatives --install /usr/bin/x-window-manager \
x-window-manager /usr/bin/mutter 60 \
--slave /usr/share/man/man1/x-window-manager.1.gz \
x-window-manager.1.gz /usr/share/man/man1/mutter.1.gz
fi
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