What does `--frontend` do in `do-release-upgrade` and where can I find the list of possible values?

While checking the manual for do-release-upgrade, I found out that it has a --frontend argument that can be passed to the command along with a value. However, the manpage doesn't explain what the argument exactly does, or what are the available values for it.

       -f FRONTEND, --frontend=FRONTEND
              Run the specified frontend

My assumption is that it to allow us to go through a specific application like the Software Updater or the command-line. Can I find a better description and a list of possible values for that argument?

Solution 1:

From https://wiki.ubuntu.com/UpdateManagerFaq

There are also different user interfaces for the release upgrader. Those can be changed via "--frontend" and the following are available "DistUpgradeViewText", "DistUpgradeViewGtk", "DistUpgradeViewKDE".

Unfortunately, the wiki links for these options show

This page does not exist yet.