@Joe, Follow these steps (they worked for me last week):

1. Make sure that the /etc/apt/sources.list.d is empty (move files to
anywhere else, if needed).

2. Make your /etc/apt/sources.list look like this:

#deb http://archive.ubuntu.com/ubuntu/ feisty main restricted universe 
multiverse
#deb http://archive.ubuntu.com/ubuntu/ feisty-updates main restricted universe 
multiverse
#deb http://archive.ubuntu.com/ubuntu/ feisty-backports main restricted 
universe multiverse
#deb http://archive.ubuntu.com/ubuntu feisty-security main restricted universe 
multiverse

deb http://old-releases.ubuntu.com/ubuntu/ feisty main restricted universe 
multiverse
deb http://old-releases.ubuntu.com/ubuntu/ feisty-updates main restricted 
universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ feisty-backports main restricted 
universe multiverse
deb http://old-releases.ubuntu.com/ubuntu feisty-security main restricted 
universe multiverse
deb http://old-releases.ubuntu.com/ubuntu feisty-backports main/debian-installer

3. Install latest feisty versions available from old-releases:

sudo apt-get update && sudo apt-get dist-upgrade

4. Start upgrade to gutsy:

sudo do-release-upgrade

5. When asked if sources.list should be overwritten, open a new terminal
and change your sources.list like this (i.e. uncomment archive and
comment old-releases):

deb http://archive.ubuntu.com/ubuntu/ feisty main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ feisty-updates main restricted universe 
multiverse
deb http://archive.ubuntu.com/ubuntu/ feisty-backports main restricted universe 
multiverse
deb http://archive.ubuntu.com/ubuntu feisty-security main restricted universe 
multiverse

#deb http://old-releases.ubuntu.com/ubuntu/ feisty main restricted universe 
multiverse
#deb http://old-releases.ubuntu.com/ubuntu/ feisty-updates main restricted 
universe multiverse
#deb http://old-releases.ubuntu.com/ubuntu/ feisty-backports main restricted 
universe multiverse
#deb http://old-releases.ubuntu.com/ubuntu feisty-security main restricted 
universe multiverse
#deb http://old-releases.ubuntu.com/ubuntu feisty-backports 
main/debian-installer

6. Say yes to overwrite sources.list and let the upgrade begin.

HTH

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