Hi I am trying to install a kubernetes cluster with kubeadm on my ubuntu 16.04.6 LTS. I am following the official kubernetes documentation but I am facing some issues when trying to pull the images to initialize the kubernetes cluser with kueadm init command.

When I try to pull the images beforehand I got this error:

root@kube-master:/home/osboxes# kubeadm config images pull --v=5
I0616 15:06:22.575056    1713 initconfiguration.go:103] detected and using CRI socket: /var/run/dockershim.sock
I0616 15:06:22.575243    1713 interface.go:400] Looking for default routes with IPv4 addresses
I0616 15:06:22.575251    1713 interface.go:405] Default route transits interface "enp0s3"
I0616 15:06:22.575520    1713 interface.go:208] Interface enp0s3 is up
I0616 15:06:22.575574    1713 interface.go:256] Interface "enp0s3" has 2 addresses :[192.168.1.73/24 fe80::6027:e7f8:e098:2610/64].
I0616 15:06:22.575590    1713 interface.go:223] Checking addr  192.168.1.73/24.
I0616 15:06:22.575596    1713 interface.go:230] IP found 192.168.1.73
I0616 15:06:22.575603    1713 interface.go:262] Found valid IPv4 address 192.168.1.73 for interface "enp0s3".
I0616 15:06:22.575608    1713 interface.go:411] Found active IP 192.168.1.73
I0616 15:06:22.575644    1713 version.go:183] fetching Kubernetes version from URL: https://dl.k8s.io/release/stable-1.txt
W0616 15:06:23.323407    1713 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]
[config/images] Pulled k8s.gcr.io/kube-apiserver:v1.18.3
[config/images] Pulled k8s.gcr.io/kube-controller-manager:v1.18.3
[config/images] Pulled k8s.gcr.io/kube-scheduler:v1.18.3
[config/images] Pulled k8s.gcr.io/kube-proxy:v1.18.3
[config/images] Pulled k8s.gcr.io/pause:3.2
exit status 1
output: 3.4.3-0: Pulling from etcd
39fafc05754f: Pulling fs layer
3736e1e115b8: Pulling fs layer
79de61f59f2e: Pulling fs layer
79de61f59f2e: Verifying Checksum
filesystem layer verification failed for digest sha256:79de61f59f2e05bea0e6bb531e1cbd87cdd8000d14e3504f8f3e2ce32f0bb4ba
, error
k8s.io/kubernetes/cmd/kubeadm/app/util/runtime.(*DockerRuntime).PullImage
        /workspace/anago-v1.18.3-beta.0.58+d6e40f410ca91c/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/cmd/kubeadm/app/util/runtime/runtime.go:175
k8s.io/kubernetes/cmd/kubeadm/app/cmd.PullControlPlaneImages
        /workspace/anago-v1.18.3-beta.0.58+d6e40f410ca91c/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/cmd/kubeadm/app/cmd/config.go:515
k8s.io/kubernetes/cmd/kubeadm/app/cmd.NewCmdConfigImagesPull.func1
        /workspace/anago-v1.18.3-beta.0.58+d6e40f410ca91c/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/cmd/kubeadm/app/cmd/config.go:488
k8s.io/kubernetes/vendor/github.com/spf13/cobra.(*Command).execute
        /workspace/anago-v1.18.3-beta.0.58+d6e40f410ca91c/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/github.com/spf13/cobra/command.go:826
k8s.io/kubernetes/vendor/github.com/spf13/cobra.(*Command).ExecuteC
        /workspace/anago-v1.18.3-beta.0.58+d6e40f410ca91c/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/github.com/spf13/cobra/command.go:914
k8s.io/kubernetes/vendor/github.com/spf13/cobra.(*Command).Execute
        /workspace/anago-v1.18.3-beta.0.58+d6e40f410ca91c/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/github.com/spf13/cobra/command.go:864
k8s.io/kubernetes/cmd/kubeadm/app.Run
        /workspace/anago-v1.18.3-beta.0.58+d6e40f410ca91c/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/cmd/kubeadm/app/kubeadm.go:50
main.main
        _output/dockerized/go/src/k8s.io/kubernetes/cmd/kubeadm/kubeadm.go:25
runtime.main
        /usr/local/go/src/runtime/proc.go:203
runtime.goexit
        /usr/local/go/src/runtime/asm_amd64.s:1357
failed to pull image "k8s.gcr.io/etcd:3.4.3-0"
k8s.io/kubernetes/cmd/kubeadm/app/cmd.PullControlPlaneImages
        /workspace/anago-v1.18.3-beta.0.58+d6e40f410ca91c/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/cmd/kubeadm/app/cmd/config.go:516
k8s.io/kubernetes/cmd/kubeadm/app/cmd.NewCmdConfigImagesPull.func1
        /workspace/anago-v1.18.3-beta.0.58+d6e40f410ca91c/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/cmd/kubeadm/app/cmd/config.go:488
k8s.io/kubernetes/vendor/github.com/spf13/cobra.(*Command).execute
        /workspace/anago-v1.18.3-beta.0.58+d6e40f410ca91c/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/github.com/spf13/cobra/command.go:826
k8s.io/kubernetes/vendor/github.com/spf13/cobra.(*Command).ExecuteC
        /workspace/anago-v1.18.3-beta.0.58+d6e40f410ca91c/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/github.com/spf13/cobra/command.go:914
k8s.io/kubernetes/vendor/github.com/spf13/cobra.(*Command).Execute
        /workspace/anago-v1.18.3-beta.0.58+d6e40f410ca91c/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/vendor/github.com/spf13/cobra/command.go:864
k8s.io/kubernetes/cmd/kubeadm/app.Run
        /workspace/anago-v1.18.3-beta.0.58+d6e40f410ca91c/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/cmd/kubeadm/app/kubeadm.go:50
main.main
        _output/dockerized/go/src/k8s.io/kubernetes/cmd/kubeadm/kubeadm.go:25
runtime.main
        /usr/local/go/src/runtime/proc.go:203
runtime.goexit
        /usr/local/go/src/runtime/asm_amd64.s:1357

Can someone help me please? Thanks in advance