Thanks for your report.

The packages indexes failed to download
2011-04-30 17:56:04,703 ERROR IOError/SystemError in cache.update(): 'W:Failed 
to fetch 
http://us.archive.ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages.gz  
Hash Sum mismatch
, E:Some index files failed to download, they have been ignored, or old ones 
used instead.'. Retrying (currentRetry: 0)
2011-04-30 17:56:08,992 ERROR IOError/SystemError in cache.update(): 'W:Failed 
to fetch 
http://us.archive.ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages.gz  
Hash Sum mismatch
, E:Some index files failed to download, they have been ignored, or old ones 
used instead.'. Retrying (currentRetry: 1)
2011-04-30 17:56:12,065 ERROR IOError/SystemError in cache.update(): 'W:Failed 
to fetch 
http://us.archive.ubuntu.com/ubuntu/dists/natty/main/binary-i386/Packages.gz  
Hash Sum mismatch
, E:Some index files failed to download, they have been ignored, or old ones 
used instead.'. Retrying (currentRetry: 2)

This is usually caused by a server or network error. Please try again or
use another mirror.

I'm closing this report because it is not a bug with Ubuntu.

** Changed in: update-manager (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/774235

Title:
  Update manager - Unable to upgrade to 11.04 from 10.10

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