为什么我会收到错误 101？我的 DNS 如何参与？

Question

我开始Update information is outdated警觉了。我试过sudo apt-get update并得到这些错误：

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/Release.gpg  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://repository.spotify.com/dists/stable/Release.gpg  Something wicked happened resolving 'repository.spotify.com:http' (-11 - System error)
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/main/i18n/Translation-en_IN  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/main/i18n/Translation-en  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/multiverse/i18n/Translation-en_IN  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/multiverse/i18n/Translation-en  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/restricted/i18n/Translation-en_IN  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/restricted/i18n/Translation-en  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/universe/i18n/Translation-en_IN  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/universe/i18n/Translation-en  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/universe/source/Sources  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/main/source/Sources  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/multiverse/source/Sources  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/restricted/source/Sources  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/main/binary-i386/Packages  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/restricted/binary-i386/Packages  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/universe/binary-i386/Packages  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/multiverse/binary-i386/Packages  Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::13). - connect (101: Network is unreachable) [IP: 2001:67c:1562::13 80]

E: Some index files failed to download. They have been ignored, or old ones used instead.

我遵循了这个线程的最佳答案，它解决了这个问题。

但是有人请解释问题是什么以及它是如何解决的？

Answer 1

如果您收到此类错误，则意味着您的 IPv6 连接不稳定，或者服务器已失效，或者找不到文件。目前正在努力解决：

http://[2001:67c:1562::13]/ubuntu/dists/raring-security/multiverse/binary-i386/

Answer 2

更改您的网络代理设置，使其与您用于访问此网页的网络代理设置（简称您的浏览器代理）同步