If you're trying to login as root at the graphical login, this might be disabled by default (it is in Debian). You can change that in the GDM login setup somewhere in your menu or by editing /etc/gdm/gdm.conf. Generally this is disabled as a safety measure. From your user, open a terminal and type su - which should prompt you for the root password. This will make you root (your prompt should change from a $ to a #) for whatever commands you type next. Type exit when you're done being root.
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