>From Mainlog.txt:

2012-03-27 16:11:25,418 ERROR IOError/SystemError in cache.update(): 'W:Failed 
to fetch http://archive.ubuntu.com/ubuntu/dists/precise-updates/Release.gpg  
Something wicked happened resolving 'archive.ubuntu.com:http' (-5 - No address 
associated with hostname)
, W:Failed to fetch 
http://security.ubuntu.com/ubuntu/dists/maverick-security/Release.gpg  
Something wicked happened resolving 'security.ubuntu.com:http' (-5 - No address 
associated with hostname)
, E:Some index files failed to download. They have been ignored, or old ones 
used instead.'. Retrying (currentRetry: 0)

It seems to me that there was an error with your network connection and
trying to connect to the Ubuntu archive.

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https://bugs.launchpad.net/bugs/966055

Title:
  when try upgrading to 12.04 from 10.04

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