Recovering root password in vmware for ubuntu 12.10

Recovering root password in vmware for ubuntu 12.10

I have installed Ubuntu 12.10 in vmware, and I am not able to understand
why is it rejecting root password upon entering it on in the terminal.
So I would like to have a new password instead.
Can someone guide me through the procedure of changing a root password on
Ubuntu 12.10 which is installed on vmware player.
I have not forgotten the root password, as a matter of fact during the
installing process it asked just for a single password i.e. my user
password which I also do remember and no mention about the root password
was done.
So I am not able to understand has it considered the same as the root
password or is there something else by default?