diff --git a/tasks/Debian.yml b/tasks/Debian.yml
index b25a8c5..c9396cd 100644
--- a/tasks/Debian.yml
+++ b/tasks/Debian.yml
@@ -29,7 +29,7 @@
     dest: /etc/default/grub
     regexp: '^(GRUB_CMDLINE_LINUX=".*)"$'
     line: '\1 cgroup_enable=memory swapaccount=1"'
-    backrefs: yes
+    backrefs: true
   when:
     - not docker_installed.stat.exists
 
@@ -39,7 +39,7 @@
     - not docker_installed.stat.exists
 
 - name: Check whether ufw status is active
-  ansible.builtin.shell: ufw status
+  ansible.builtin.command: ufw status
   changed_when: false
   ignore_errors: true
   register: ufw_check
diff --git a/tasks/main.yml b/tasks/main.yml
index 4296d06..47c1500 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -60,7 +60,8 @@
 #
 # - port TCP et UDP 7946: permet la communication entre les machines du swarm
 #
-# - interfaces docker0 and docker_gwbridge ? firewall-cmd --change-zone=docker0 --zone=trusted --permanent; firewall-cmd --change-zone=docker_gwbridge --zone=trusted --permanent
+# - interfaces docker0 and docker_gwbridge ?
+#   firewall-cmd --change-zone=docker0 --zone=trusted --permanent; firewall-cmd --change-zone=docker_gwbridge --zone=trusted --permanent
 
 - name: Install python library for docker
   ansible.builtin.package: