PREUN
/bin/sh
if [ $1 = 0 ]; then /usr/sbin/update-alternatives --remove go /usr/lib/golang/bin/go fi
POSTIN
/bin/sh
/usr/sbin/update-alternatives --install /usr/bin/go \ go /usr/lib/golang/bin/go 90 \ --slave /usr/bin/gofmt gofmt /usr/lib/golang/bin/gofmt