[Bug 1432366] [NEW] dist upgrade to kubuntu 14.10 failed to load all packages

[Hugo]

Public bug reported:

http://archive.ubuntu.com/ubuntu/dists/utopic/Release  Unable to find expected entry 'unstable/source/Sources' in Release file (Wrong sources.list entry or malformed file)
, E:Some index files failed to download. They have been ignored, or old ones used instead.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1432366

Title:
  dist upgrade to  kubuntu 14.10 failed to load all packages

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  http://archive.ubuntu.com/ubuntu/dists/utopic/Release  Unable to find expected entry 'unstable/source/Sources' in Release file (Wrong sources.list entry or malformed file)
  , E:Some index files failed to download. They have been ignored, or old ones used instead.

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