[Bug 1079335] Re: Error occurred while distribution upgrade extras

[mpgarate]

This bug prevents me from upgrading to Oneric. After appearing, the
update manager undoes operations and closes.

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https://bugs.launchpad.net/bugs/1079335

Title:
  Error occurred while distribution upgrade extras

Status in “update-manager” package in Ubuntu:
  Incomplete

Bug description:
  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-amd64/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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