Public bug reported:

Binary package hint: update-manager

During a Dapper->Gutsy upgrade, if /etc/apt/apt.conf contains:

  Acquire::http::Proxy "http://localhost:3128/";;

And there is no proxy listening, the upgrade silently fails -- it
appears that the upgrade fetched the files but then could not extract
them (the actual case is that it never fetched them):

  # do-release-upgrade -d
  Checking for a new ubuntu release
  Failed Upgrade tool signature
  Failed Upgrade tool
  Done downloading            
  extracting 'hardy.tar.gz'
  Failed to extract
  Extracting the upgrade failed. There may be a problem with the network or 
with the server. 

strace shows the http method failing:

  [pid 29230] write(1, "400 URI Failure\nURI:
http://archive.ubuntu.com/ubuntu/dists/hardy/main/dist-upgrader-
all/current/hardy.tar.gz\nMessage: Could not connect to localhost:3128
(127.0.0.1). - connect (111 Connection refused) \nFailReason:
ConnectionRefused\nTransient-Failure: true\n\n", 259) = 259

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

-- 
silent fetch failure if proxy mis-configured
https://bugs.launchpad.net/bugs/219951
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