Allow stopping ubuntu unattended-upgrades (#12174)

Signed-off-by: Ekko Tu <lihai.tu@daocloud.io>

roles/bootstrap_os/tasks/ubuntu.yml

@@ -19,3 +19,11 @@
   when:
     - ubuntu_kernel_unattended_upgrades_disabled
     - unattended_upgrades_file_stat.stat.exists
+
+- name: Stop unattended-upgrades service
+  service:
+    name: unattended-upgrades
+    state: stopped
+    enabled: false
+  become: true
+  when: ubuntu_stop_unattended_upgrades