- Kubeadm: fixed a bug during kubeadm upgrade, where it is not possible to mount a new device and create a symbolic link for /etc/kubernetes (or a sub-directory) so that kubeadm stores its information on the mounted device. ([#123406](https://github.com/kubernetes/kubernetes/pull/123406), [@SataQiu](https://github.com/SataQiu))

* kubeadm: fix a bug related to volume unmount if the kubelet run directory is a symbolic link ([#77507](https://github.com/kubernetes/kubernetes/pull/77507), [@cuericlee](https://github.com/cuericlee))
* n/a ([#78059](https://github.com/kubernetes/kubernetes/pull/78059), [@figo](https://github.com/figo))

  - `kubectl convert`, deprecated since v1.14, will be removed in v1.17.
  - The `--export` flag for the `kubectl get` command, deprecated since v1.14, will be removed in v1.18.
  - `kubectl cp` no longer supports copying symbolic links from containers; to support this use case, see `kubectl exec --help` for examples using `tar` directly ([#82143](https://github.com/kubernetes/kubernetes/pull/82143), [@soltysh](https://github.com/soltysh))