Update init_worker_node.sh

instructions/kubernetes/init_worker_node.sh

@@ -1,6 +1,6 @@
 #! /usr/bin/bash
 # Author: Markos Genios, Filip Fitzermann
-# Assumes running on Ubuntu 20.04
+# Assumes running on Ubuntu 24.04
 
 
 # apt update
@@ -16,11 +16,11 @@ sudo apt install -y docker.io
 sudo systemctl enable --now docker
 
 # Install auxiliary packages
-sudo apt install -y apt-transport-https ca-certificates curl
-curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
-echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
+sudo apt-get install -y apt-transport-https ca-certificates curl gpg
+curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.30/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
 sudo apt update
 
 # Install kubelet, kubeadm and kubectl and prevent them from being updated in the future
-sudo apt install -y kubelet=1.27.3-00 kubeadm=1.27.3-00 kubectl=1.27.3-00
+sudo apt install -y kubelet kubeadm kubectl
 sudo apt-mark hold kubelet kubeadm kubectl
+sudo systemctl enable --now kubelet