I've been trying to update my Itanium workstation to Gutsy for quite some time now.  I even tried a 'clean' install only to roll back to Feisty.  Every time I try to upgrade IA64 to Gutsy, I see following messages:

"Getting upgrade prerequisites failed
The system was unable to get the prerequisites for the upgrade. The upgrade will abort now and restore the original system state.
Please report this as a bug against the 'update-manager' package and include the files in /var/log/dist-upgrade/ in the bugreport."

After following bug report's suggestion, I go to /var/log/dist-upgrade and this is what I see:

[nobody@system:/var/log/dist-upgrade]$
$=> ls -ltr
total 8
-rw-r--r-- 1 root root    0 2007-12-26 10:43 apt.log
-rw-r--r-- 1 root root    0 2007-12-26 11:14 term.log
-rw-r--r-- 1 root root 5080 2007-12-26 11:14 main.log
[nobody@system:/var/log/dist-upgrade]$
$=>

There is no 'bugreport.*'.  I guess, this is another "bug" to report.  In any case, main.log reports this:

$=> cat main.log
2007-12-26 11:14:39,579 INFO release-upgrader version '0.81' started
2007-12-26 11:14:40,352 DEBUG lsb-release: 'feisty'
2007-12-26 11:14:40,353 DEBUG _pythonSymlinkCheck run
2007-12-26 11:14:40,965 DEBUG checkViewDepends()
2007-12-26 11:14:40,966 DEBUG getRequiredBackports()
2007-12-26 11:14:43,845 ERROR IOError in cache.update(): 'Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/feisty-backports/main/debian-installer/binary-ia64/Packages.gz 404 Not Found [IP: 91.189.88.46 80]
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty/main/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty/main/source/Sources.gz 404 Not Found
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty-security/main/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty/restricted/source/Sources.gz 404 Not Found
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty-security/restricted/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty-updates/main/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty-updates/restricted/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty-updates/main/source/Sources.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty-updates/restricted/source/Sources.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty-security/main/source/Sources.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty-security/restricted/source/Sources.gz 404 Not Found
'. Retrying (currentRetry: 0)
2007-12-26 11:14:46,556 ERROR IOError in cache.update(): 'Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/feisty-backports/main/debian-installer/binary-ia64/Packages.gz 404 Not Found [IP: 91.189.88.45 80]
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty/main/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty/main/source/Sources.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty/restricted/source/Sources.gz 404 Not Found
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty-security/main/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty-security/restricted/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty-updates/main/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty-updates/main/source/Sources.gz 404 Not Found
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty-updates/restricted/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty-updates/restricted/source/Sources.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty-security/main/source/Sources.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty-security/restricted/source/Sources.gz 404 Not Found
'. Retrying (currentRetry: 1)
2007-12-26 11:14:49,354 ERROR IOError in cache.update(): 'Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty/main/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/feisty-backports/main/debian-installer/binary-ia64/Packages.gz 404 Not Found [IP: 91.189.88.46 80]
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty-security/main/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty/main/source/Sources.gz 404 Not Found
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty-security/restricted/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty/restricted/source/Sources.gz 404 Not Found
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty-updates/main/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ftp.esat.net/mirrors/archive.ubuntu.com/dists/feisty-updates/restricted/binary-ia64/Packages.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty-updates/main/source/Sources.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty-updates/restricted/source/Sources.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty-security/main/source/Sources.gz 404 Not Found
Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/feisty-security/restricted/source/Sources.gz 404 Not Found
'. Retrying (currentRetry: 2)
2007-12-26 11:14:49,355 ERROR doUpdate() failed complettely
2007-12-26 11:14:49,965 ERROR Can not find backport 'release-upgrader-apt'

Any ideas why those packages are missing?