Do not add certbot repo for Debian

2.Common_services/7.LetsEncrypt/0_setup.py

@@ -2,6 +2,7 @@
 # -*- coding: utf-8 -*-
 import os
 import re
+import subprocess
 
 import utils
 
@@ -25,13 +26,20 @@ def setup(interactive=True):
         utils.log('The configuration does not use the default certificate, letsencrypt will not be used.')
         return
     # Install certbot
-    cmds = [
-        'apt-get update',
-        'apt-get install -y software-properties-common',
-        'add-apt-repository ppa:certbot/certbot -y',
+    lsb_release = subprocess.run(['lsb_release', '-a'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT).stdout
+    if b'Ubuntu' in lsb_release:
+        # Add repo if OS is Ubuntu
+        cmds = [
+            'apt-get update',
+            'apt-get install -y software-properties-common',
+            'add-apt-repository ppa:certbot/certbot -y',
+        ]
+    else:
+        cmds = []
+    cmds.extend([
         'apt-get update',
         'apt-get install -y certbot',
-    ]
+    ])
     utils.run_commands(cmds)
     # Get system domains
     domains = list()