diff --git a/content/en/admin/prerequisites.md b/content/en/admin/prerequisites.md
index 5019be02..c557e92a 100644
--- a/content/en/admin/prerequisites.md
+++ b/content/en/admin/prerequisites.md
@@ -6,7 +6,7 @@ menu:
     parent: admin
 ---
 
-If you are setting up a fresh machine, it is recommended that you secure it first. Assuming that you are running **Ubuntu 18.04**:
+If you are setting up a fresh machine, it is recommended that you secure it first. Assuming that you are running **Ubuntu 20.04**:
 
 ## Do not allow password-based SSH login \(keys only\)
 
@@ -14,6 +14,10 @@ First make sure you are actually logging in to the server using keys and not via
 
 Edit `/etc/ssh/sshd_config` and find `PasswordAuthentication`. Make sure it’s uncommented and set to `no`. If you made any changes, restart sshd:
 
+```bash
+systemctl restart ssh.service
+```
+
 ## Update system packages
 
 ```bash
@@ -22,6 +26,12 @@ apt update && apt upgrade -y
 
 ## Install fail2ban so it blocks repeated login attempts
 
+First, install fail2ban:
+
+```bash
+apt install fail2ban
+```
+
 Edit `/etc/fail2ban/jail.local` and put this inside:
 
 ```text