尝试从20.10升级到Ubuntu 21.04时出错

Question

每当我尝试运行软件更新程序时，我只会得到错误“未能下载存储库。信息请检查您的互联网连接。”每当我运行sudo apt update时，我都会得到错误

Get:6 https://packages.riot.im/debian default InRelease [2,892 B]
Err:6 https://packages.riot.im/debian default InRelease
  The following signatures were invalid: EXPKEYSIG C2850B265AC085BD riot.im packages <packages@riot.im>
Reading package lists... Done
W: GPG error: https://packages.riot.im/debian default InRelease: The following signatures were invalid: EXPKEYSIG C2850B265AC085BD riot.im packages <packages@riot.im>
E: The repository 'https://packages.riot.im/debian default InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.`

Answer 1

您必须使用下面的命令更新存储库GPG密钥

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com C2850B265AC085BD

wget -q -O - https://packages.riot.im/element-release-key.gpg | sudo apt-key add -
wget -q -O - https://packages.riot.im/element-release-key-2020.gpg | sudo apt-key add -
wget -q -O - https://packages.riot.im/riot-release-key.gpg | sudo apt-key add -

然后，将所有具有新依赖项的更新安装到当前系统。

sudo apt-get update
sudo apt-get dist-upgrade