+elif grep -xFq 'VERSION="9 (stretch)"' /etc/os-release; then
+ gpg -a --recv-keys 2BF8D9FE074BCDE4; gpg -a --export 2BF8D9FE074BCDE4 | apt-key add -
+
+ cat >/etc/apt/sources.list.d/fai.list <<'EOF'
+deb http://fai-project.org/download stretch koeln
+EOF
+else
+ rm -f /etc/apt/sources.list.d/fai.list