prerm is in lxde-common 0.5.0-4ubuntu3.
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 | #!/bin/sh -e
if [ "$1" = "remove" ] || [ "$1" = upgrade ]; then
update-alternatives --remove x-session-manager /usr/bin/startlxde
fi
exit 0
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