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In Fedora 22 and Ubuntu 15.04, whenever I boot into "single-user"/"recovery" mode, I'm asked for the root password. This is a new behavior; I remember that it used to drop me straight into the root shell. I'm not asking how to reset root password, I already know how to do this. I'm asking how to restore the old behavior in newer releases. I think that it's somehow related to systemd, but I don't know the details.