After you get this error, try sudo apt-get -f install

http://askubuntu.com/questions/118749/package-system-is-broken-how-to-fix-it

NS2: Zhibin's experience

http://www.winlab.rutgers.edu/~zhibinwu/html/network_simulator_2.html

NS-2.34 INSATALLATION STEPS

https://www.dropbox.com/s/8ascsws1608f0ur/NS2%20installation%20steps.pdf?dl=0

https://abdusyarif.wordpress.com/2012/07/11/solved-problem-step-by-step-installing-ns-2-34-ubuntu-12-04-lts/