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运行 Ubuntu 16.04.4 LTS。

运行时sudo apt update，最终行如下：

W: GPG error: http://download.opensuse.org/repositories/home:/osmc/xUbuntu_16.04  Release: The following signatures were invalid: KEYEXPIRED 1482381670\nE: The repository \'http://download.opensuse.org/repositories/home:/osmc/xUbuntu_16.04  Release\' is not signed.\nN: Updating from such a repository can\'t be done securely, and is therefore disabled by default.\nN: See apt-secure(8) manpage for repository creation and user configuration details.\n

apt-key list显示一键已过期：

pub   2048R/70F1BBEA 2014-10-14 [expired: 2016-12-22]\nuid                  home:osmc OBS Project <home:osmc@build.opensuse.org>\n

（但由于某种原因，apt-key list | grep \xe2\x80\x9cexpired:\xe2\x80\x9d没有返回任何内容。）

尝试更新此密钥不会改变任何内容：