Thank you for taking the time to report this issue and helping to make
Ubuntu better. Examining the information you have given us, this does
not appear to be a bug report so we are closing it and converting it to
a question in the support tracker. We understand the difficulties you
are facing, but it is better to raise problems you are having in the
support tracker at https://answers.launchpad.net/ubuntu if you are
uncertain if they are bugs. You can also find a valid help posting your
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reporting bugs, see https://help.ubuntu.com/community/ReportingBugs.


simply, try to remove the ppa you added. plus this upgrading from 11.04 to 
12.04 is not officially supported, even if possible.

** Changed in: ubuntu
       Status: New => Invalid

** Converted to question:
   https://answers.launchpad.net/ubuntu/+question/202432

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https://bugs.launchpad.net/bugs/1020943

Title:
  I cannot upgrade Ubuntu 11.04 to 12.04. Update manager crashes and
  shows me this:  W:Failed to fetch http://ppa.launchpad.net/lorenzo-
  carbonell/atareao/ubuntu/dists/natty/main/source/Sources  404  Not
  Found , W:Failed to fetch http://ppa.launchpad.net/lorenzo-
  carbonell/atareao/ubuntu/dists/natty/main/binary-i386/Packages  404
  Not Found , E:Some index files failed to download. They have been
  ignored, or old ones used instead.

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