Error while upgrading Edgy (drubuntu) to Feisty

I've just downloaded and started drubuntu (http://groups.drupal.org/node/6260) which is a vmware image of ubuntu with LAMP+Drupal+Eclipse+PHPeclipse+etc

It runs fine, but since it's an old Edgy, I wanted to upgrade to Hardy and I'm not able to do this.

I've updated using Update Manager and now I only see "New distribution release '7.04' is available", but when I click the "Upgrade" button, it says "Error during update A problem occured during the update. This is usually some sort of network problem, please check your network connection and retry." and then it lists a lot of Fetch errors

Here is my sources.list contents:
#------------------------------------------------------------------------------------------BEGIN OF SOURCES.LIST CONTENTS
deb http://us.archive.ubuntu.com/ubuntu/ edgy main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ edgy restricted main multiverse universe #Added by software-properties

## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ edgy-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ edgy-updates restricted main multiverse universe #Added by software-properties

## Uncomment the following two lines to add software from the 'universe'
## repository.
## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
# deb http://gb.archive.ubuntu.com/ubuntu/ edgy universe
# deb-src http://gb.archive.ubuntu.com/ubuntu/ edgy universe

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb http://gb.archive.ubuntu.com/ubuntu/ edgy-backports main restricted universe multiverse
# deb-src http://gb.archive.ubuntu.com/ubuntu/ edgy-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu edgy-security main restricted
deb-src http://security.ubuntu.com/ubuntu edgy-security main restricted #Added by software-properties
# deb http://security.ubuntu.com/ubuntu edgy-security universe
# deb-src http://security.ubuntu.com/ubuntu edgy-security universe
deb http://www.getautomatix.com/apt edgy main
deb http://wine.budgetdedicated.com/apt edgy main

#AUTOMATIX REPOS START

deb http://archive.canonical.com/ubuntu edgy-commercial main

deb http://us.archive.ubuntu.com/ubuntu/ edgy-backports main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ edgy-backports main restricted universe multiverse #Added by software-properties

deb http://us.archive.ubuntu.com/ubuntu/ edgy-updates universe multiverse

deb http://us.archive.ubuntu.com/ubuntu/ edgy-security main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ edgy-security main restricted universe multiverse #Added by software-properties

deb http://us.archive.ubuntu.com/ubuntu/ edgy universe multiverse
#AUTOMATIX REPOS END
#--------------------------------------------------------------------------------------------END OF SOURCES.LIST CONTENTS

i also tried following this tutorial (http://bliki.rimuhosting.com/space/knowledgebase/linux/distros/ubuntu) but it gave me errors and I didn't know how to fix them.

If anyone can pls help me I'd appreciate it very much.