Update to latest let's encrypt / certbot steps.

Author: mikeckennedy

app/ch15_deploy/final/server/server_setup.sh

@@ -74,9 +74,27 @@ update-rc.d nginx enable
 service nginx restart
 
 
-# Optionally add SSL support via Let's Encrypt:
-# https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-18-04
+# Optionally add SSL support via Let's Encrypt
+# NOTE: These steps have changed since the recording.
 
-add-apt-repository ppa:certbot/certbot
-apt install python-certbot-nginx
+####### NEW STEPS ###############################################
+# See https://certbot.eff.org/instructions?ws=nginx&os=ubuntufocal&tab=standard
+
+# Because always a good idea :)
+apt update
+apt upgrade
+
+# Not need even though it's in the instructions, is installed on Ubuntu
+# Skip -> install snapd https://snapcraft.io/docs/installing-snapd
+
+snap install --classic certbot
+ln -s /snap/bin/certbot /usr/bin/certbot
 certbot --nginx -d fakepypi.talkpython.com
+
+####### THESE ARE THE OLD STEPS #################################
+#
+## https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-18-04
+#
+#add-apt-repository ppa:certbot/certbot
+#apt install python-certbot-nginx
+#certbot --nginx -d fakepypi.talkpython.com