W: Failed to fetch https://download.docker.com/linux/ubuntu/dists/noble/InRelease Temporary failure resolving 'download.docker.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/noble/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/noble-updates/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/noble-backports/InRelease Temporary failure resolving 'archive.ubuntu.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/noble-security/InRelease Temporary failure resolving 'security.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.这里显示 Temporary failure resolving，在网络技术中， resolving 就是指DNS解析过程。