如果我执行 sudo apt-get update。我获得：
GPG error: http://cdn-fastly.deb.debian.org/debian jessie Release: The following signatures were invalid: EXPKEYSIG 7638D0442B90D010 Debian Archive Automatic Signing Key (8/jessie) <[email protected]> EXPKEYSIG CBF8D6FD518E17E1 Jessie Stable Release Key <[email protected]> 75DDC3C4A499F1A18CB5F3C8CBF8D6FD518E17E1
E: The repository 'http://http.debian.net/debian jessie Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
我怎样才能解决这个问题？
感谢您的反馈。
我安装的 Ubuntu：分销商 ID：Ubuntu 描述：Ubuntu 20.04.5 LTS 发行版：20.04 代号：focal
答案1
已解决。已从 /etc/apt/sources.list 中删除源