E: unable to locate package ros-indigo-desktop-full

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I am getting the same error. I tried the 4 steps ( http://wiki.ros.org/indigo/Installati... ) and when I do :

sudo apt-get install ros-indigo-desktop-full

I get the error.

E: unable to locate package ros-indigo-desktop-full

When I check for the ros-latest.list, I get the following output:

....@ubuntu:~$ cat /etc/apt/sources.list.d/ros-latest.list 

deb http://packages.ros.org/ros/ubuntu vivid main

Let me know what might be going on.

I am running ubuntu 15.04 on vmware player