This is because Natty has reached its end of life and is no longer
supported so those urls are not available.
** Changed in: update-manager (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1157860
Title:
W:Failed to fetch
http://extras.ubuntu.com/ubuntu/dists/natty/main/source/Sources.gz
404 Not Found , W:Failed to fetch
http://extras.ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages.gz
404 Not Found , E:Some index files failed to download, they have been
ignored, or old ones used instead.
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