Ubuntu is easy, most friendly and the most popular distribution which makes Linux really fun. I have been posting about how to reset windows administrator password and now here is a way to reset root password in Ubuntu. There is a way of resetting the root password via booting into rescue mode but this one is more smart and quick.
By default, you will need "sudo" (substitute user) privileges to install or change any system level programs or features due to security. This password will be the same as the password you had set when installing Ubuntu. Root is a different user with a default password, that's why when you do the "su" command and try and provide the root password, it never works. Okay the problem is that you can log on as a normal user, but not as root, because you do not know the root password.