This file is indexed.

prerm is in liblapack3gf 3.5.0-2ubuntu1.

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.

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#! /bin/sh

set -e

if [ "$1" = "upgrade" ]
then
# Remove the old declaration
    update-alternatives --display liblapack.so.3gf >/dev/null 2>&1 && update-alternatives --remove-all liblapack.so.3gf
fi

if [ "$1" != "upgrade" ]
then
# For the transition liblapack3gf => liblapack3
    update-alternatives --remove liblapack.so.3gf /usr/lib/liblapack/liblapack.so.3
fi



exit 0