in terminal write : sudo apt-get install gcc g++ python python-dev mercurial bzr gdb valgrind gsl-bin libgsl0-dev libgsl0ldbl flex bison tcpdump sqlite sqlite3 libsqlite3-dev libxml2 libxml2-dev libgtk2.0-0 libgtk2.0-dev uncrustify doxygen graphviz imagemagick texlive texlive-latex-extra texlive-generic-extra texlive-generic-recommended texinfo dia texlive texlive-latex-extra texlive-extra-utils texlive-generic-recommended texi2html python-pygraphviz python-kiwi python-pygoocanvas libgoocanvas-dev python- pygccxml

cd 
mkdir ns3 
cd 

ns3 ## Installing NS-3 :

wget http://www.nsnam.org/release/ns-allinone-3.19.tar.bz2 
tar xjf ns-allinone-3.19.tar.bz2 cd ns-allinone-3.19/ 

./build.py --enable-examples --enable-tests 
./waf -d debug --enable-examples --enable-tests configure 

./test.py