upgrade to snap certbot if old one is used (#2267)

lib.sh

@@ -769,11 +769,25 @@ fi
 
 # Install certbot (Let's Encrypt)
 install_certbot() {
-certbot --version 2> /dev/null
-LE_IS_AVAILABLE=$?
-if [ $LE_IS_AVAILABLE -eq 0 ]
+if certbot --version >/dev/null 2>&1
 then
-    certbot --version 2> /dev/null
+    # Reinstall certbot (use snap instead of package)
+    # https://askubuntu.com/a/1271565
+    if dpkg -l | grep certbot >/dev/null 2>&1
+    then
+        # certbot will be removed, but still listed, so we need to check if the snap is installed as well so that this doesn't run every time
+        if ! snap list certbot >/dev/null 2>&1
+        then
+            print_text_in_color "$ICyan" "Reinstalling certbot (Let's Encrypt) as a snap instead..."
+            apt-get remove certbot -y
+            apt-get autoremove -y
+            install_if_not snapd
+            snap install core
+            snap install certbot --classic
+            # Update $PATH in current session (login and logout is required otherwise)
+            check_command hash -r
+        fi
+    fi
 else
     print_text_in_color "$ICyan" "Installing certbot (Let's Encrypt)..."
     install_if_not snapd