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Lab 3.1 step 3
root@k8s-lab31:~# apt-get install -y docker.io
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package docker.io is not available, but is referred to by another package.This may mean that the package is missing, has been obsoleted, oris only available from another source
E: Package 'docker.io' has no installation candidate