different whiptail warning if ubuntu 20.04

setup/so-setup

@@ -69,11 +69,20 @@ detect_os
 set_palette >> $setup_log 2>&1
 
 if [[ $not_supported ]]; then
-	if (whiptail_unsupported_os_warning); then
-		true
+	if [[ "$OSVER" == "focal" ]]; then
+		if (whiptail_focal_warning); then
+			true
+		else
+			info "User cancelled setup."
+			whiptail_cancel
+		fi
 	else
-		info "User cancelled setup."
-		whiptail_cancel
+		if (whiptail_unsupported_os_warning); then
+			true
+		else
+			info "User cancelled setup."
+			whiptail_cancel
+		fi
 	fi
 fi