ns-2.34 problem executing 'nam' on ubuntu 9.10

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http://www.linuxquestions.org – I successfully installed and validate ns-allinone-2.34 network simulator on ubuntu-9.10. I then tried to run simple tcl code and ended up on the following error. I couldn't move ahead from there. What should I do to make 'nam(version 1.14)' work on my ubuntu 9.10???? Thanks in advance ns: finish: couldn't execute "nam": no such file or directory while executing "exec nam out.nam &" (procedure "finish" line 7) invoked from within "finish" Here is the code I tried to run (for reference): #Create a simulator object set ns [new Simula (HowTos)