prerm is in ubuntu-core-config 0.6.40.
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 | #!/bin/sh -e
if [ "$1" = remove ]; then
pam-auth-update --package --remove snappy-extrausers
fi
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