我的每个 apt-get 命令都以这样的内容结尾：
Err http://security.ubuntu.com quantal-security Release.gpg
Temporary failure resolving 'security.ubuntu.com'
Err http://rs.archive.ubuntu.com quantal Release.gpg
Temporary failure resolving 'rs.archive.ubuntu.com'
Err http://rs.archive.ubuntu.com quantal-updates Release.gpg
Temporary failure resolving 'rs.archive.ubuntu.com'
Err http://rs.archive.ubuntu.com quantal-backports Release.gpg
Temporary failure resolving 'rs.archive.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://rs.archive.ubuntu.com/ubuntu/dists/quantal/Release.gpg Temporary failure resolving 'rs.archive.ubuntu.com'
W: Failed to fetch http://rs.archive.ubuntu.com/ubuntu/dists/quantal-updates/Release.gpg Temporary failure resolving 'rs.archive.ubuntu.com'
W: Failed to fetch http://rs.archive.ubuntu.com/ubuntu/dists/quantal-backports/Release.gpg Temporary failure resolving 'rs.archive.ubuntu.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/quantal-security/Release.gpg Temporary failure resolving 'security.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.
我尝试了 --fix-missing、update、autoremove...但问题仍然存在