prerm is in libgksu2-0 2.0.13~pre1-6ubuntu8.
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 | #!/bin/sh
set -e
if [ "$1" = "remove" ]; then
update-alternatives --remove libgksu-gconf-defaults \
/usr/share/libgksu/debian/gconf-defaults.libgksu-su
update-alternatives --remove libgksu-gconf-defaults \
/usr/share/libgksu/debian/gconf-defaults.libgksu-sudo
fi
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