prerm 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 | #!/bin/sh
set -e
action="$1"
if [ "$action" = remove ]; then
update-alternatives --remove x-window-manager \
/usr/bin/mutter
fi
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