installing NS 2 on ubuntu

Leila M mech.loulou at
Mon Sep 19 13:53:26 UTC 2011

i'm new in using ubuntu; i'm trying to install Network Simulator NS 2 but
each time I get the following error when trying to execute the following
sudo apt-get install build-essential
E: couldn't find packet build-essential

please help me to solve this problem
best regards
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