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There are few steps you need to perform before doing any thing else. I think you missed one step out of that which we need to perform after proper installation of ROS that is Environment setup

Please visit following link and make sure you have perform steps from 1.1 to 1.7 if you have not done so far ....

http://www.ros.org/wiki/groovy/Installation/Ubuntu

This is normally the problem when you have not done Environment setup
There are few steps you need to perform before doing any thing else. else. I think you missed one step out of that which we need to perform after proper installation of ROS that is Environment setup

Please visit following link and make sure you have perform steps from 1.1 to 1.7 if you have not done so far ....

http://www.ros.org/wiki/groovy/Installation/Ubuntu

This is normally the problem when you have not done Environment setup
There are few steps you need to perform before doing any thing else. I think you missed one step out of that which we need to perform after proper installation of ROS that is Environment setup

Please visit following link and make sure you have perform steps from 1.1 to 1.7 if you have not done so far ....

http://www.ros.org/wiki/groovy/Installation/Ubuntu

If you have already done the environmental setup then you need to run roscore command that is the master program through which all other program communicate to get performed in ROS .....

**$ roscore**

I hope your problem will be solved by that.

This is normally the problem when you have not done Environment setup
There are few steps you need to perform before doing any thing else. I think you missed one step out of that which we need to perform after proper installation of ROS that is Environment setup

Please visit following link and make sure you have perform steps from 1.1 to 1.7 if you have not done so far ....

http://www.ros.org/wiki/groovy/Installation/Ubuntu

If you have already done the environmental setup then you need to run roscore command that is the master program through which all other program communicate to get performed in ROS .....

**$ roscore**
$ roscore

I hope your problem will be solved by that.