sed -i "s#jessie#stretch#g" /etc/apt/sources.list.d/debian.list /etc/apt/sources.list.d/security.list &&
dpkg --clear-avail &&
if [ -e /etc/apt/sources.list.d/buildd.debian.org.list ]; then
sed -i "s#jessie#stretch#g" /etc/apt/sources.list.d/debian.list /etc/apt/sources.list.d/security.list &&
dpkg --clear-avail &&
if [ -e /etc/apt/sources.list.d/buildd.debian.org.list ]; then