ubuntu16.04 apt-get update 升级更新报错：
W: GPG error: http://storage.googleapis.com/tensorflow-serving-apt stable InRelease: The following signatures were invalid: KEYEXPIRED 1531525724 KEYEXPIRED 1531525724 KEYEXPIRED 1531525724
W: The repository 'http://storage.googleapis.com/tensorflow-serving-apt stable InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'https://download.docker.com/linux/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
【解决】
curl https://storage.googleapis.com/tensorflow-serving-apt/tensorflow-serving.release.pub.gpg | sudo apt-key add -
