problem upgrading 13.04 to 14.04

[Colin Law]

On 18 February 2015 at 12:01, Bernard <bdebreil at teaser.fr> wrote:
> Hi to Everyone,
>
> I have seen docs to either carry a direct upgrade or do it in two steps,
> first 13.04 to 13.10 then 13.10 to 14.04. Problem is: it seems that I can't
> update my /etc/apt/sources.list using the address below, since it says it is
> restricted and that errors have occured:
>
> sudo sed -i -e
> 's/archive.ubuntu.com\|security.ubuntu.com/old-releases.ubuntu.com/g'
> /etc/apt/sources.list

Since 13.04 is not an LTS version you must do it in two steps.
Does
sudo do-release-upgrade
not do it?  Alternatively you should be able to do it from the update manager.

As always of course make sure you have all important data backed up
before attempting an upgrade.  Also it is a good idea to revert any
ppas that you may be using.

Colin