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This is the screen once installation has started.
I find the placement of the Root Password option in this screen to be rather curious - they have such a nice hub-and-spoke layout for most things in the previous step, why is setting the root password not included there?
I know that Ubuntu's ubiquity installer has had a split of information required before starting the install, and information not needed until the end for configuration, the idea being that you can "save time" or "optimize the process" by starting the file copy as soon as enough information has been given, and then gather the rest of the information while the copying is done in the background.
But at least two of the things in the preceding anaconda hub screen are not required for the basic file copy (timezone and keyboard), so if they want to "optimize" this way, why not shift them to this point? Or why not move the root password input to that hub screen, rather than here? This is not a big deal, I just find it incongruous.
Be that as it may, at this point the base system installation and configuration will take about 10-15 minutes. During that time, you have to enter a root password.