upgrade from 12.04 to 13.04 and then to 13.10

[reggler]

Hi,

I just installed a brand new machine with Ubuntu 12.04. I have have configured to companies proxy settings, updated to kubuntu-desktop, updated to the latest on this version, and can use it seemingly seamless but. I would like to upgrade to the latest and greatest in terms of Kubuntu but to get from 12.04 to 13.04 I've been trying the following `sudo do-release-upgrade` -d but it just doesn't seem to work:

...
...
Hit http://us.archive.ubuntu.com trusty-backports/universe Translation-en                                                                                             
Fetched 0 B in 0s (0 B/s)                                                                                                                                             

Error during update 

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

W:Failed to fetch 
http://extras.ubuntu.com/ubuntu/dists/trusty/main/source/Sources 404 
Not Found 
, W:Failed to fetch 
http://extras.ubuntu.com/ubuntu/dists/trusty/main/binary-i386/Packages 
404 Not Found 
, E:Some index files failed to download. They have been ignored, or 
old ones used instead. 


Restoring original system state

Aborting
Reading package lists... Done    
Building dependency tree          
Reading state information... Done
Building data structures... Done 
root@ubuntu:~#

In http://extras.ubuntu.com/ubuntu/dists/ I can not see a directory for trusty/
any ideas what's going on here? Is it a problem with the proxy? Anyway I can upgrade with a different method?

Thanks,
Ron

[reggler]

Seems like changing

[DEFAULT]
Prompt=lts

to

[DEFAULT]
Prompt=normal

in /etc/update-manager/release-upgrades might have helped, the update is running now...