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I was getting Update information is outdated alert. I tried sudo apt-get update and got these errors:

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.

I followed this thread's top answer and it fixed the problem.

But someone please explain what was the problem and how did it got fixed?

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2 Answers 2

If you are getting those kind of errors it means that either, your IPv6 connection was unstable, or the servers were dead, or the file was not found. Right now is working through:

http://[2001:67c:1562::13]/ubuntu/dists/raring-security/multiverse/binary-i386/
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Change your network proxy settings in sync with the one you are using to access this web-page (in short your browser's proxy)

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2  
The question is “why?” not “how do I fix this?”. I also find it pretty far fetched to assume a proxy configuration error when the logs just show rather generic IP networking errors. Lastly it would be better to describe in detail how to perform the mentioned changes (see How do I write a good answer?). –  David Foerster Nov 2 at 13:28

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