Temporary failure resolving 'us.archive.ubuntu.com'
Err:3 http://us.archive.ubuntu.com/ubuntu focal-backports InReleas
Temporary faliure resolving 'us.archivve.ubuntu.com'
Err: http://us.archive.ubuntu.com/ubuntu focal-proposed InRelease
Temporary failure resolving 'us.archive.ubuntu.com'
Err:5 http://secruity.ubuntu.com/ubuntu focal-security InRelease
Temporary failure resolving 'security.ubuntu.com'
Err: 6 http://archive.canonical.com/ubuntu focal InRelease
Temporary failure resolving 'archive.canonical.com'
Reading packages lists... Done
W: Failed to fetch http://us.archive.ubuntu/dists/focal/InRelease Temporary
failure resolving 'us.ubuntu.com'
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/focal-updates/
InRelease Temporary failure resolving 'us.archive.ubuntu.com'
W: Failed to fetch http://us.archiveubuntu.com/ubuntu/dists/focal-backports/
InRelease Temporary failure resolving 'us.archive.ubuntu.com"
W: Failed to fetch http://archive.canonical.com/ubuntu/dists/focal/InRelease
Temporary failure resolving 'archive.canonical.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/focal-
security/InRelease Temporary failure resolving 'security.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones
used instead.
答案1
请查看指南以了解如何正确提出问题，以便获得良好的答案。从输出来看，您运行 apt update，并且您使用的存储库无法通过当前网络配置解析。这可能是因为您没有互联网连接（有线、wifi）或您连接的路由器没有互联网连接。另一个原因可能是您的 DNS 配置。
看起来至少 us.ubuntu.com 不是现有存储库，或者至少目前不可用。尝试更改您的存储库。
以下是一些指示： 如何将 Ubuntu Server 中的镜像从区域镜像更改为主镜像？
如果这不能解决问题，请发布您正在尝试的操作，您是否可以在浏览器中访问 google.com，以及使用工作镜像时获得的结果。
祝你好运！