Tackle lsb-release (#75)

* AR-50: Install lsb_release only if needed

debian-config-functions

@@ -35,6 +35,15 @@ function main(){
 	DIALOG_CANCEL=1
 	DIALOG_ESC=255
 
+	# we have our own lsb_release which does not use Python. Others shell install it here
+	if [[ ! -f /usr/bin/lsb_release ]]; then
+		if is_package_manager_running; then
+			sleep 3
+		fi
+		debconf-apt-progress -- apt-get update
+		debconf-apt-progress -- apt -y -qq --allow-downgrades --no-install-recommends install lsb-release
+	fi
+
 	[[ -f /etc/armbian-release ]] && source /etc/armbian-release && ARMBIAN="Armbian $VERSION $IMAGE_TYPE";
 	DISTRO=$(lsb_release -is)
 	DISTROID=$(lsb_release -sc)