Ubuntu default root password

So what is the ubuntu default root password? I have just installed Ubuntu 10.10 and during the installation process it did not ask for the root password.

After the installation is finished, I try to login as a root using the "su" command. However, when it asked for the password, I could not login. There is no default/empty password for root.

It turns out you need to set the root password first by using this command:

sudo passwd
Enter new UNIX password: 
Retype new UNIX password: 

You can also login as a root without setting the password by using this command:

sudo su