Kubernetes Ports in Use

General Discussions
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Hi everybody, I installed k8s on ubuntu 22.04. kubelet, kubectl, kubeadm and docker are well installed and running normally.
So my problem is when I run “kubeadm init” to initialize the cluster, I have the issue below.
I need your help to solve this issue.
Thanks in advance.

code@k8s-master-cz-server:~$ sudo kubeadm init --cri-socket unix:///var/run/containerd/containerd.sock
[init] Using Kubernetes version: v1.30.3
[preflight] Running pre-flight checks
error execution phase preflight: [preflight] Some fatal errors occurred:
	[ERROR Port-6443]: Port 6443 is in use
	[ERROR Port-10259]: Port 10259 is in use
	[ERROR Port-10257]: Port 10257 is in use
	[ERROR FileAvailable--etc-kubernetes-manifests-kube-apiserver.yaml]: /etc/kubernetes/manifests/kube-apiserver.yaml already exists
	[ERROR FileAvailable--etc-kubernetes-manifests-kube-controller-manager.yaml]: /etc/kubernetes/manifests/kube-controller-manager.yaml already exists
	[ERROR FileAvailable--etc-kubernetes-manifests-kube-scheduler.yaml]: /etc/kubernetes/manifests/kube-scheduler.yaml already exists
	[ERROR FileAvailable--etc-kubernetes-manifests-etcd.yaml]: /etc/kubernetes/manifests/etcd.yaml already exists
	[ERROR Port-2379]: Port 2379 is in use
	[ERROR Port-2380]: Port 2380 is in use
	[ERROR DirAvailable--var-lib-etcd]: /var/lib/etcd is not empty
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`
To see the stack trace of this error execute with --v=5 or higher

I also checked the ports

code@k8s-master-cz-server:~$ nc 127.0.0.1 10257 -v
Connection to 127.0.0.1 10257 port [tcp/*] succeeded!