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2016-10-10 16:15:03 -0500 received badge  Teacher (source)
2016-10-07 12:39:49 -0500 answered a question The real turtlebo pose in gmapping

IMO, the position changes might be results of pose correction by the SLAM algorithm you are using. Why its position is corrected? Because the sensors on your robot are getting vague or less data needed by the SLAM algorithm and the algorithm is trying to figure out where your robot really is at, by comparing previously generated map with data obtained by the sensors on your robot. If the SLAM algorithm is not sure, it will move the robot to where it thinks the robot really is at.

I don't understand what you mean about the real robot pose from gazebo, perhaps you want RVIZ show correctly its real position in gazebo world?

Then you should improve the accuracy and performance of the sensors on your robot, SLAM algorithm will more likely show the correct position of your robot in gazebo.

edit: fix typo

2016-10-07 12:22:41 -0500 answered a question no name spaces found while running gazebo what to do?

If I recall correctly, you only have to wait until all the models are downloaded from gazebosim.org and it's an one time effort. After all needed models are downloaded, it won't happen again and gazebo will be initialized fast.

2016-10-07 06:34:10 -0500 answered a question kinect virtual machine

Are you using virtual machines for installing ROS?

I tried using VMs for ROS but they often don't function correctly.

I would suggest using a real PC install for ROS.