Your thread Subject is rather misleading,
mobile3, because your fundamental problem is that you cannot log-in as root user. It's possible that you have done something incorrect. If it isn't the obvious inadvertent Caps Lock or Num Lock situation, try entering the following command:
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sudo passwd
You'll be prompted first to enter
your password, not the root user's password. Enter that, then specify a new root user's password (you'll be prompted to re-enter it, as usual).