prerm is in maas-region-controller 2.4.0~beta2-6865-gec43e47e6-0ubuntu1.
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 | #!/bin/sh
set -e
. /usr/share/debconf/confmodule
invoke-rc.d maas-regiond stop || true
. /usr/share/dbconfig-common/dpkg/prerm.pgsql
dbc_go maas-region-controller $@
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