[Bug 1357830] Re: W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/raring/main/source/Sources 404 Not Found , E:Some index files failed to download. They have been ignored, or old ones used instead.

[Brian Murray]

The Ubuntu release raring is End of Life and you should remove any
sources.list entries (e.g. in /etc/apt/sources.list) that refer to it.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1357830

Title:
  W:Failed to fetch
  http://extras.ubuntu.com/ubuntu/dists/raring/main/source/Sources  404
  Not Found , E:Some index files failed to download. They have been
  ignored, or old ones used instead.

Status in “ubuntu-release-upgrader” package in Ubuntu:
  Incomplete

Bug description:
  upgrading from Kubuntu 13.10 to Kubuntu 14.04

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