from /var/log/dist-upgrade/main.log :

2009-02-24 21:56:48,234 INFO release-upgrader version '0.81' started
2009-02-24 21:56:54,230 DEBUG lsb-release: 'feisty'
2009-02-24 21:56:54,231 DEBUG _pythonSymlinkCheck run
2009-02-24 21:56:57,190 DEBUG checkViewDepends()
2009-02-24 21:56:57,191 DEBUG getRequiredBackports()
2009-02-24 21:56:59,082 ERROR IOError in cache.update(): 'Failed to fetch 
http://us.archive.ubuntu.com/ubuntu/dists/feisty-backports/main/debian-installer/binary-i386/Packages.gz
 404 Not Found
'. Retrying (currentRetry: 0)
2009-02-24 21:57:01,108 ERROR IOError in cache.update(): 'Failed to fetch 
http://us.archive.ubuntu.com/ubuntu/dists/feisty-backports/main/debian-installer/binary-i386/Packages.gz
 404 Not Found
'. Retrying (currentRetry: 1)
2009-02-24 21:57:03,145 ERROR IOError in cache.update(): 'Failed to fetch 
http://us.archive.ubuntu.com/ubuntu/dists/feisty-backports/main/debian-installer/binary-i386/Packages.gz
 404 Not Found
'. Retrying (currentRetry: 2)
2009-02-24 21:57:03,145 ERROR doUpdate() failed complettely
2009-02-24 21:57:10,852 ERROR Can not find backport 'release-upgrader-apt'

so - tried adding :
# 91.189.88.35 is old-releases.ubuntu.com
91.189.88.35    us.archive.ubuntu.com
 to /etc/hosts to try and fool it ...

did not work - so tried a command line wget to test:
# wget 
http://us.archive.ubuntu.com/ubuntu/dists/feisty-backports/main/debian-installer/binary-i386/Packages.gz
--21:59:35--  
http://us.archive.ubuntu.com/ubuntu/dists/feisty-backports/main/debian-installer/binary-i386/Packages.gz
           => `Packages.gz'
Resolving us.archive.ubuntu.com... 91.189.88.35
Connecting to us.archive.ubuntu.com|91.189.88.35|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
21:59:35 ERROR 404: Not Found.

same in browser - using old-releases works, using us.archive fails even with 
hosts entry.
tried ftp hoping to get around apache vhosts, same problem.

so - just speculating - it appears that the fix is to fix that actual package
the file is apparently from: 
.../gutsy/main/dist-upgrader-all/current/gutsy.tar.gz
offending file is:  prerequists-sources.list
change line:
deb http://${countrymirror}archive.ubuntu.com/ubuntu feisty-backports 
main/debian-installer
to:
deb http://old-releases.ubuntu.com/ubuntu feisty-backports main/debian-installer

-- 
7.04->7.10 "Upgrade" fails: "Getting upgrade prerequisites failed"
https://bugs.launchpad.net/bugs/153980
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