Modify all possible locations of certbot to use Python 3

tasks/install.yml

@@ -18,9 +18,13 @@
     state: 'present'
     update_cache: yes
 
-- name: ""
+- name: "Force certbot to use Python 3"
   lineinfile:
-    path: '/usr/local/bin/certbot'
+    path: '{{ item }}'
     regexp: '^#!/usr/bin/python$'
     line: '#!/usr/bin/python3'
+  with_items:
+    - '/usr/local/bin/certbot'
+    - '/usr/bin/certbot'
   ignore_errors: yes
+  failed_when: false