Hi Mansour
The version that you are using is 4.1 which is very very old, currrent version is 4.6. In addition, you could have run that in windows without installing in Ubuntu. however, I also have it in ubuntu 14 and I prefer that in Ubuntu.
So, the first thing to do is download the latest version from
please also search the forum for "bashrc", you should add some line to the "bashrc" file, it is not essential if you are using GUI (graphic user interface).
In the bashrc you export the library of OMNET.
like:
At the end you can run sumo,
To install omnet plz follow the instruction either from