[Bug 1357011] Re: upgrade failed due get new software sources

[Brian Murray]

Natty is an End of Life release and subsequently has been removed from
the Ubuntu archive and likely most mirrors.  You'll need to remove any
natty entries from your /etc/apt/sources.list file to resolve the issue.

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

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https://bugs.launchpad.net/bugs/1357011

Title:
  upgrade failed due get new software sources

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

Bug description:
  W:Failed to fetch http://ubuntu.mirror.cambrium.nl/ubuntu/dists/natty/main/source/Sources  404  Not Found
  , W:Failed to fetch http://ubuntu.mirror.cambrium.nl/ubuntu/dists/natty/universe/source/Sources  404  Not Found
  , E:Some index files failed to download. They have been ignored, or old ones used instead.

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