$ ./tools/kubernetes/install_k8s.sh 
Hit:1 https://download.docker.com/linux/ubuntu jammy InRelease
Hit:2 http://security.ubuntu.com/ubuntu jammy-security InRelease
Hit:3 http://kr.archive.ubuntu.com/ubuntu jammy InRelease
Hit:4 http://kr.archive.ubuntu.com/ubuntu jammy-updates InRelease
Hit:5 http://kr.archive.ubuntu.com/ubuntu jammy-backports InRelease
Reading package lists... Done
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
lsb-release is already the newest version (11.1.0ubuntu4).
ca-certificates is already the newest version (20230311ubuntu0.22.04.1).
curl is already the newest version (7.81.0-1ubuntu1.16).
gnupg is already the newest version (2.2.27-3ubuntu2.1).
apt-transport-https is already the newest version (2.4.12).
0 upgraded, 0 newly installed, 0 to remove and 218 not upgraded.
Found Docker Engine in the system. Skip Docker Engine installation.
deb [signed-by=/etc/apt/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main
Hit:1 https://download.docker.com/linux/ubuntu jammy InRelease
Hit:2 http://kr.archive.ubuntu.com/ubuntu jammy InRelease                                               
Hit:3 http://security.ubuntu.com/ubuntu jammy-security InRelease                
Hit:4 http://kr.archive.ubuntu.com/ubuntu jammy-updates InRelease
Hit:6 http://kr.archive.ubuntu.com/ubuntu jammy-backports InRelease
Ign:5 https://packages.cloud.google.com/apt kubernetes-xenial InRelease
Err:7 https://packages.cloud.google.com/apt kubernetes-xenial Release
  404  Not Found [IP: 172.217.161.238 443]
Reading package lists... Done
E: The repository 'https://apt.kubernetes.io kubernetes-xenial Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package kubelet
E: Unable to locate package kubectl
E: Unable to locate package kubeadm
E: Unable to locate package kubelet
E: Unable to locate package kubeadm
E: Unable to locate package kubectl
E: No packages found
sudo: kubeadm: command not found
cp: cannot stat '/etc/kubernetes/admin.conf': No such file or directory
chown: cannot access '/home/tiokim/.kube/config': No such file or directory
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  218k  100  218k    0     0   135k      0  0:00:01  0:00:01 --:--:--  135k
./tools/kubernetes/install_k8s.sh: line 61: kubectl: command not found
./tools/kubernetes/install_k8s.sh: line 62: kubectl: command not found