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Thanks to all replies. They were valuable for me to understand the problem. Initially on noticing missing move_base package, i copied move_base folders mindlessly with out trying "sudo apt-get install ros-indigo-move-base" command first.
IThen, I deleted existing move_base folders in /opt/ros/indigo/lib, opt/ros/indigo/include, opt/ros/indigo/share folders and tried "sudo apt-get install ros-indigo-move-base". This prompted me that i have latest version of ros-indigo-move-base already installed. So i tried, "sudo apt-get install --reinstall ros-indigo-move-base" and this worked for me.
The problem may be because the paths may not be provided properly between lib and share folders and reinstalling set it.