Forgot your root password?? No problems, this is how you can reset your root password:

For this press e when GRUB selection menu pops up. Now write the following as parameter: init=/bin/bash
Now press Enter. You will get a # prompt. Now write the following command to change your root password.
#passwd
Now enter your new desired password twice.
Reboot your system & now you can login to your system as root with the newly set root password.