Adding few docs comments, minor fixes

README.md

 
 ## Prerequisites
 
-- A Linux VM with Ubuntu Server (20.04 minimum, 22.04 recommended)
+- A Linux VM with Ubuntu Server (20.04 minimum, 22.04 recommended).
 - A Domain name (can be root or subdomain) but it is a must the A record for the domain to be pointed to the server's public IP.
-  - e.g. `example.com A 1.1.1.1`: Being `example.com` the domain record and `1.1.1.1` the public IP of the server
+  - e.g. `example.com A 1.1.1.1`: Being `example.com` the domain record and `1.1.1.1` the public IP of the server.
+- Ports `80` and `443` MUST be accessible from the internet to the server.
+  - This installation does not yet support a server running behind a proxy.
 
 ## Components
 

matrix/install.sh

 cp -R . ${BASE_DIR}
 cd ${BASE_DIR}
 
+# Disable "Pending Kernel upgrade" banner
+sed -i "s|#\$nrconf{kernelhints} = -1;|\$nrconf{kernelhints} = -1;|g" /etc/needrestart/needrestart.conf
+
 # Baseline utils
 echo -e "Installing baseline utils\n"
 apt update