首先，我是 Linux 命令行的新手。我以前从未使用过它。我的问题是该命令apt-get update只会返回：
Err:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Temporary failure resolving 'us.archive.ubuntu.com'
Err:2 http://us.archive.ubuntu.com/ubuntu xenial-security InRelease
Temporary failure resolving 'us.archive.ubuntu.com'
Err:3 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease
Temporary failure resolving 'us.archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial/InRelease Temporary failure resolving 'us.archive.ubuntu.com'
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-security/InRelease Temporary failure resolving 'us.archive.ubuntu.com'
W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/xenial-updates/InRelease Temporary failure resolving 'us.archive.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.
我的sources.list文件看起来像这样： …
apt ×1