Comment 14 for bug 1333140

Interesting, do-release-upgrade -d is certainly supposed to work. A bug report with the precise failure would be appreciated! s/utopic/vivid/ in /etc/apt/sources.list and good old "apt full-upgrade" (or apt-get dist-upgrade) works well. But keep in mind that vivid is still under development and pre-feature freeze/beta. So you might want to try a live system first (or only) :-)

Either way, I was mostly curious whether this only affects 14.04 or newer releases too.