echo "deb tor+http://ncomputers.org/debian stretch main" > /etc/apt/sources.list.d/ncomputers.org-stretch.list
echo "deb http://ncomputers.org/debian stretch main" > /etc/apt/sources.list.d/ncomputers.org-stretch.list
apt-get update
apt-get install ncomputers.org-keyring
apt-get update