root@ubuntu:/# sudo apt update 错误:1 http://archive.ubuntu.com/ubuntu focal InRelease 暂时无法解析“archive.ubuntu.com” 错误:2 http://security.ubuntu.com/ubuntu foal-security InRelease 暂时无法解析“security.ubuntu.com” 错误:3 http://ports.ubuntu.com/ubuntu-ports 焦点 InRelease 暂时无法解析“ports.ubuntu.com” 错误:4 http://archive.ubuntu.com/ubuntu foal-updates InRelease 暂时无法解析“archive.ubuntu.com” 错误:5 http://ports.ubuntu.com/ubuntu-ports focal-updates InRelease 暂时无法解析“ports.ubuntu.com” 错误:6 http://archive.ubuntu.com/ubuntu focal-backports InRelease 暂时无法解析“archive.ubuntu.com” 错误:7 http://ports.ubuntu.com/ubuntu-ports focal-backports InRelease 暂时无法解析“ports.ubuntu.com” 错误:8 http://ports.ubuntu.com/ubuntu-ports focal-security InRelease 暂时无法解析“ports.ubuntu.com” 正在读取软件包列表...完成 构建依赖关系树 正在读取状态信息...完成 所有软件包都是最新的。 宽:无法获取 http://archive.ubuntu.com/ubuntu/dists/focal/InRelease 暂时无法解析“archive.ubuntu.com” 宽:无法获取 http://archive.ubuntu.com/ubuntu/dists/focal-updates/InRelease 暂时无法解析“archive.ubuntu.com” 宽:无法获取 http://archive.ubuntu.com/ubuntu/dists/focal-backports/InRelease 暂时无法解析“archive.ubuntu.com” 宽:无法获取 http://security.ubuntu.com/ubuntu/dists/focal-security/InRelease 暂时无法解析“security.ubuntu.com” 宽:无法获取 http://ports.ubuntu.com/ubuntu-ports/dists/focal/InRelease 暂时无法解析“ports.ubuntu.com” 宽:无法获取 http://ports.ubuntu.com/ubuntu-ports/dists/focal-updates/InRelease 暂时无法解析“ports.ubuntu.com” 宽:无法获取 http://ports.ubuntu.com/ubuntu-ports/dists/focal-backports/InRelease 暂时无法解析“ports.ubuntu.com” 宽:无法获取 http://ports.ubuntu.com/ubuntu-ports/dists/focal-security/InRelease 暂时无法解析“ports.ubuntu.com” 宽:某些索引文件下载失败。它们已被忽略或使用旧文件代替。