How To Fix "su: Authentication failure" In ubuntu

This the error when we try to enter to SUper user account of ubuntu.

rahul@rahul-desktop:~/Desktop$ su
su: Authentication failure

This error can be fixed by enable root user in Ubuntu.Follow these steps to enable super user.

Login as Administrator
Open terminal ( Short cut - Alt + Ctrl + T )
type sudo passwd root and press enter
[sudo] password for rahul: Enter Sudo Password
Enter new UNIX password: Enter Root user Password
Retype new UNIX password: Confirm Root user Password

Now you will be notified "passwd: password updated successfully".Now you are able to use SU in terminal.

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