diff --git a/ubuntu.yaml b/ubuntu.yaml
index 8e485c1..5c185e3 100644
--- a/ubuntu.yaml
+++ b/ubuntu.yaml
@@ -2,6 +2,8 @@
 # 顺序 early-commands > 安装系统 > late-commands > 重启进入系统 > cloud-init: runcmd > cloud-init: 其他
 autoinstall:
   version: 1
+  apt:
+    fallback: offline-install
   source:
     id: ubuntu-server-minimal
     search_drivers: false