uwsim problem while installation in indigo

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i tried the steps for installation on my ros-indigo as stated in this page http://www.irs.uji.es/uwsim/wiki/inde... but , when i run rosrun uwsim uwsim this command . i am getting an error

yuvaram@yuvaram-Lenovo-G40-45:~$ rosrun uwsim uwsim
[rosrun] Couldn't find executable named uwsim below /opt/ros/indigo/share/uwsim
[rosrun] Found the following, but they're either not files,
[rosrun] or not executable:
[rosrun]   /opt/ros/indigo/share/uwsim

steps i follower while installing

1. sudo apt-get install ros-indigo-uwsim
2. roscore
3. rosrun uwsim uwsim

it will be a great help if someone can figure out what my problem is and help me with this thank you