我尝试进行更新时看到以下错误。
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://download.opensuse.org/repositories/home:/clearcontainers:/clear-containers-3/xUbuntu_16.04 Release: The following signatures were invalid: KEYEXPIRED 1562449942
W: Failed to fetch http://download.opensuse.org/repositories/home:/clearcontainers:/clear-containers-3/xUbuntu_16.04/Release.gpg The following signatures were invalid: KEYEXPIRED 1562449942
W: Some index files failed to download. They have been ignored, or old ones used instead.
http://download.opensuse.org/repositories/home:/clearcontainers:/clear-containers-3/xUbuntu_16.04/
我已尝试删除密钥并再次更新，但使用相同的密钥却无法正常工作。 我试图从普通服务器上获取该密钥，但它们却没有（例如pgp.mit.edu和keys.gnupg.net）。
有人知道如何解决此问题吗？