[untothebreach]

It's weird, if I go to the web page linked here, I see the release, but running the 'sudo do-release-upgrade' command reports the same thing as yours.

[karlshea]

I seem to remember that when 12 LTS was released that it was a month or so until you could pull it using do-release-upgrade. Something about wanting to make sure everything was stable before they pushed it that way? It's been awhile so I'm not sure.