Edit file File name : liblapack3:amd64.preinst Content :#!/bin/sh set -e # Cleanup pre-multiarch alternative if [ "$1" = "upgrade" ] && dpkg --compare-versions "$2" lt 3.7.1-2~ then update-alternatives --remove liblapack.so.3 /usr/lib/lapack/liblapack.so.3 fi exit 0 Save