upgrade from 10.10 to 12.04

[ESimard]

Hi, I have two machines running ubuntu v10.04 and v10.10. On the 10.04 machine the upgrade manager offered 12.04 as an upgrade which I did successfully. However on the 10.10 machine the upgrade manager only offers 11.04. Attempting to run this after the unsupported message the "fetch failed" possible network problem. Net work is fine chrome can connect. Next I tried do-release-upgrade with the following messages

Checking for a new ubuntu release
Err Upgrade tool signature
404 Not Found [IP: 91.189.92.201 80]
Err Upgrade tool
404 Not Found [IP: 91.189.92.201 80]
Fetched 0B in 0s (0B/s)
WARNING:root:file 'natty.tar.gz.gpg'missing
Failed to fetch
Fetching the upgrade failed. There maybe a network problem.

This installation is on a dual boot 32bit machine. What is the next step to try?
Thanks _Ernie

[coffeecat]

With your 10.10 machine, you would be much better off doing a fresh install of 12.04 or even 14.04, both supported LTS (long term support) releases. 10.10, 11.04 and 11.10 are all end of life and unsupported, and to get to 12.04 from 10.10 you would need to use the old-releases repository described here:

https://help.ubuntu.com/community/EOLUpgrades

In theory, you could go 10.10 -> 11.04 -> 11.10 -> 12.04 to get to a supported release, but that would take a very long time, involve large downloads and there would be the potential for something going wrong at every step. It would be something I would only attempt as an experiment, not something I would trust on a production system.

Back up your data and re-install fresh with an installation CD/USB prepared with the 12.04.4 ISO would be my advice:

http://releases.ubuntu.com/12.04/

EDIT: also have a look at the EOL sticky:

http://ubuntuforums.org/showthread.php?t=2229730

[ESimard]

Thanks will do a fresh install.
_E