I did this: sudo apt-get install g++ g++-4.4 automake libtool libxmu-dev xgraph
but the output is: Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package xgraph how to solve it? -- View this message in context: http://network-simulator-ns-2.7690.n7.nabble.com/Aquasim-installation-problem-tp29785p29800.html Sent from the ns-users mailing list archive at Nabble.com.