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运行更新命令 sudo apt-get update 比如如下，错误信息 Err:7 http://de.archive.ubuntu.com/ubuntu bionic-updates InRelease Connection failed [IP: 141.30.62.22 80] Err:8 http://de.archive.ubuntu.com/ubuntu bionic-backports InRelease Connection failed [IP: 14

原因: gpg signature key 过期了 查看确认此gpg signature key的过期状态 sudo apt-key list 解决方案如下 sudo apt-key adv --keyserver keys.gnupg.net --recv-keys 8C718D3B5072E1F5