diff --git a/README.md b/README.md
index 7b05291..ac3eaa7 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 - **集群特性** `TLS`双向认证、`RBAC`授权、[多Master高可用](docs/setup/00-planning_and_overall_intro.md#ha-architecture)、支持`Network Policy`、备份恢复、[离线安装](docs/setup/offline_install.md)
 - **集群版本** kubernetes v1.17, v1.18, v1.19, v1.20
-- **操作系统** CentOS/RedHat 7, Debian 9/10, Ubuntu 1604/1804
+- **操作系统** CentOS/RedHat 7, Debian 9/10, Ubuntu 16.04/18.04/20.04
 - **运行时** docker 18.09.x, 19.03.x, 20.10.x [containerd](docs/setup/containerd.md) v1.4.3
 - **网络** [calico](docs/setup/network-plugin/calico.md), [cilium](docs/setup/network-plugin/cilium.md), [flannel](docs/setup/network-plugin/flannel.md), [kube-ovn](docs/setup/network-plugin/kube-ovn.md), [kube-router](docs/setup/network-plugin/kube-router.md)
 
diff --git a/ezdown b/ezdown
index f342615..3e67f22 100755
--- a/ezdown
+++ b/ezdown
@@ -17,7 +17,7 @@ DOCKER_VER=20.10.5
 KUBEASZ_VER=3.0.1
 K8S_BIN_VER=v1.21.0
 EXT_BIN_VER=0.9.2
-SYS_PKG_VER=0.3.3
+SYS_PKG_VER=0.4.1
 HARBOR_VER=v2.1.3
 REGISTRY_MIRROR=CN
 
diff --git a/roles/prepare/tasks/offline.yml b/roles/prepare/tasks/offline.yml
index 108081b..f447bfb 100644
--- a/roles/prepare/tasks/offline.yml
+++ b/roles/prepare/tasks/offline.yml
@@ -36,6 +36,23 @@
   when: ansible_distribution_release == "bionic"
   ignore_errors: true
 
+- block:
+  - name: 分发 basic_focal 离线包
+    copy:
+      src: "{{ base_dir }}/down/packages/basic_focal.tar.gz"
+      dest: "/opt/kube/packages/basic/basic_focal.tar.gz"
+
+  # 离线安装包可能需要安装多次才能成功
+  - name: 安装 basic_focal 离线包
+    shell: 'cd /opt/kube/packages/basic && tar zxf basic_focal.tar.gz && \
+           dpkg -i *.deb > /tmp/install_basic.log 2>&1'
+    register: install_info
+    until: not install_info.failed
+    retries: 3
+    delay: 1
+  when: ansible_distribution_release == "focal"
+  ignore_errors: true
+
 - block:
   - name: 分发 basic_centos7 离线包
     copy: