It's a problem with the gpg signature of the repository. With an app as
"y ppa manager" you can go to the advanced section and execute the "try
to fil all GPG BADSIG errors". I don't  know others ways but that's a
working trik.

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

** Converted to question:
   
https://answers.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+question/258388

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https://bugs.launchpad.net/bugs/1386463

Title:
  W:Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists
  /utopic-backports/universe/source/Sources  Somma hash non
  corrispondente

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