Где найти этот gpg key?
Err:6 https://packages.cloud.google.com/apt kubernetes-xenial InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B53DC80D13EDEF05
Reading package lists... Done
W: GPG error: https://packages.cloud.google.com/apt kubernetes-xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B53DC80D13EDEF05
E: The repository 'https://apt.kubernetes.io kubernetes-xenial InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.