diff --git a/README.md b/README.md
index 9e3b3ff..04c94ed 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ for it using Letsencrypt. The certificate is set to be autorenewed every 3 month
 
 # Requirements
 
-The role currently supports only Ubuntu
+The role currently supports only Ubuntu 20.04 (using snap to install Certbot)
 
 # Installation
 
diff --git a/tasks/certbot.yml b/tasks/certbot.yml
index 57fc96e..c58f386 100644
--- a/tasks/certbot.yml
+++ b/tasks/certbot.yml
@@ -1,6 +1,10 @@
 - name: get a certificate
   become: yes
   command: "certbot --nginx -d {{ https_reverse_proxy_domain_name }} --non-interactive --agree-tos -m {{ https_reverse_proxy_certificate_contact_email }} {{ '--redirect' if https_reverse_proxy_redirect }}"
+  args:
+    creates: '/etc/letsencrypt/live/{{ https_reverse_proxy_domain_name }}/fullchain.pem'
 - name: setup autorenew of certificate
   become: yes
   command: certbot renew
+  args:
+    creates: false
\ No newline at end of file
diff --git a/tasks/check_vars.yml b/tasks/check_vars.yml
index 22e2e69..d8b72a8 100644
--- a/tasks/check_vars.yml
+++ b/tasks/check_vars.yml
@@ -2,7 +2,7 @@
 - name: check if all required variables are set
   fail:
     msg: "{{ item }} is not defined or empty"
-  when: item not in vars or vars[item] == ""
+  when: item not in vars or vars[item] is not defined 
   with_items:
     - https_reverse_proxy_domain_name
     - https_reverse_proxy_site_name
diff --git a/tasks/install.yml b/tasks/install.yml
index a234e50..8cd8053 100644
--- a/tasks/install.yml
+++ b/tasks/install.yml
@@ -1,10 +1,11 @@
-- name: setup certbot apt repo
+- name: install certbot
   become: yes
-  apt_repository:
-    repo: "ppa:certbot/certbot"
-- name: install nginx and certbot
+  snap:
+    name: certbot
+    classic: yes
+- name: install nginx
   become: yes
   apt:
     force_apt_get: yes
-    name: ["nginx", "python-certbot-nginx"]
+    name: ["nginx"]
     update_cache: yes
\ No newline at end of file
diff --git a/tasks/nginx.yml b/tasks/nginx.yml
index 58e6aff..5e6689e 100644
--- a/tasks/nginx.yml
+++ b/tasks/nginx.yml
@@ -3,6 +3,7 @@
   template:
     src: templates/nginx.j2
     dest: /etc/nginx/sites-available/{{ https_reverse_proxy_site_name }}
+    mode: '644'
   notify:
     - test nginx configuration
 - name: put reverse proxy site config in enabled