Comment 2 for bug 1611909

bdmurray@upgrade-trusty-amd64:~$ sudo do-release-upgrade -p --frontend DistUpgradeViewText

....

Fetching and installing the upgrade can take several hours. Once the
download has finished, the process cannot be canceled.

 Continue [yN] Details [d]d

No longer supported: consolekit empathy gcc-4.8-base gcc-4.9-base
  gstreamer0.10-alsa gstreamer0.10-plugins-base-apps ibus-pinyin
  libarchive-extract-perl liblog-message-simple-perl
  libmodule-pluggable-perl libpod-latex-perl libterm-ui-perl
  libtext-soundex-perl module-init-tools rhythmbox-plugin-magnatune
  software-center ssh-askpass-gnome telepathy-idle
  ubuntu-sso-client-qt ubuntu-wallpapers-trusty