diff --git a/roles/raspberrypi/tasks/prereq/Ubuntu.yml b/roles/raspberrypi/tasks/prereq/Ubuntu.yml
index b40786db..ea0f4fe5 100644
--- a/roles/raspberrypi/tasks/prereq/Ubuntu.yml
+++ b/roles/raspberrypi/tasks/prereq/Ubuntu.yml
@@ -1,5 +1,6 @@
 ---
 - name: Enable cgroup via boot commandline if not already enabled
+  when: lookup('fileglob', '/boot/firmware/cmdline.txt', errors='warn') | length == 0
   ansible.builtin.lineinfile:
     path: /boot/firmware/cmdline.txt
     backrefs: true