[Bug 877690] [NEW] unable to upgrade to 11.10 from 11.04

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W:Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/feisty-backports/main/source/Sources  404  Not Found [IP: 193.206.140.37 80]
, W:Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/feisty-backports/restricted/source/Sources  404  Not Found [IP: 193.206.140.37 80]
, W:Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/feisty-backports/universe/source/Sources  404  Not Found [IP: 193.206.140.37 80]
, W:Impossibile recuperare http://it.archive.ubuntu.com/ubuntu/dists/feisty-backports/multiverse/source/Sources  404  Not Found [IP: 193.206.140.37 80]
, E:Impossibile scaricare alcuni file di indice: saranno ignorati o verranno usati quelli vecchi.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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unable to upgrade to 11.10 from 11.04
https://bugs.launchpad.net/bugs/877690
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