According to this How to install software or upgrade from an old unsupported release? question, EOL releases are archived to http://old-releases.ubuntu.com.
But currently, I cannot see Ubuntu 12.10 and Ubuntu 13.04 to be available on this website, while all others(since 4.10) are available, as you can see in the screenshot below
So has canonical and/or Ubuntu devel-teams decided not to archive EOL releases any more?
or is it work to be done?
Best Answer
They don't transfer EOL immediately to http://old-releases.ubuntu.com, they keep them on http://releases.ubuntu.com or sometimes http://cdimage.ubuntu.com/releases/ for a while. The cdimage one seems to get cleared faster. I don't know how this time period is determined or it's length it's just something I've noticed when downloading isos.
Ubuntu 12.10 Page = http://releases.ubuntu.com/quantal/
Ubuntu 13.04 Page = http://releases.ubuntu.com/raring/
Remember their are also 3rd party mirrors sometimes available that may have older isos still available such as http://mirrors.nl.eu.kernel.org/ubuntu-releases/ which still has 12.10 here: http://mirrors.nl.eu.kernel.org/ubuntu-releases/12.10/