Unable to upgrade to ubuntu 7.10, update manager fails to update....
 

I have tried to upgrade my ubuntu to 7.10, the following message occurs when using the update manager:

A problem occurred during the update. This is usually some sort of network problem, please check your network connection and retry.

Failed to fetch http://pkg-gnome.alioth.debian.org/d...86/Packages.gz 404 Not Found
Failed to fetch http://pkg-gnome.alioth.debian.org/d...in/Packages.gz 404 Not Found

The same error appears a number of times. Using a CD copy of 7.10 i tried the following in a terminal:

gksu "sh /cdrom/cdromupgrade"

nothing happens, still a newbie, am i missing something obvious?

Well, it appears to be trying to download packages from a debian server. Can you post the contents of your /etc/apt/sources.list file?

contents are as follows:

jon@jon-bgood:/etc/apt/sources.list.d$ cat feisty-main.list
# automatically added by gnome-app-install on 2007-07-31 00:25:06.697029
deb http://gb.archive.ubuntu.com/ubuntu/ feisty main
deb http://security.ubuntu.com/ubuntu feisty-security main
deb http://eric.lavar.de/comp/linux/debian/ experimental/
deb-src http://eric.lavar.de/comp/linux/debian/ experimental/
deb http://pkg-gnome.alioth.debian.org/debian/ experimental main/
deb http://les-ejk.cz/ubuntu feisty multiverse
deb-src http://les-ejk.cz/ubuntu feisty multiverse
deb http://www.e-oss.net/ubuntu/feisty ./
deb http://pkg-gnome.alioth.debian.org/d...s/experimental main/

or

jon@jon-bgood:/etc/apt/sources.list.d$ cat feisty-universe.list
# automatically added by gnome-app-install on 2007-07-31 13:14:02.319414
deb http://gb.archive.ubuntu.com/ubuntu/ feisty universe
deb http://security.ubuntu.com/ubuntu feisty-security universe