Installing ns-2.35 in UBUNTU operating system

Step 1: open the command prompt Ctrl + Alt + T
Step 2: In the command prompt do the following
  $ sudo apt-get update
  $ sudo apt-get upgrade (this is optional)
  $  sudo apt-get install build-essential autoconf automake tcl8.5-dev tk8.5-dev perl xgraph libxt-dev  
   libx11-dev libxmu-dev    
Step 3: Download the ns allinone tar file to home folder (ex. home/prv/)
$ tar -xvzf /home/prv/Documents/ns-allinone-2.35.tar.gz
$ cd ns-allinone-2.35
prv@prv:~ns-allinone-2.35$  ./install
Step 4:  Perform the path settings
# LD_LIBRARY_PATH
OTCL_LIB=/home/prv/ns-allinone-2.35/otcl-1.14/
NS2_LIB=/home/prv/ns-allinone-2.35/lib/
USR_Local_LIB=/usr/local/lib/
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$OTCL_LIB:$NS2_LIB:$USR_Local_LIB

# TCL_LIBRARY
TCL_LIB=/home/prv/ns-allinone-2.35/tcl8.5.10/library/
USR_LIB=/usr/lib/
export TCL_LIBRARY=$TCL_LIBRARY:$TCL_LIB:$USR_LIB

# PATH
XGRAPH=/home/prv/ns-allinone-2.35/xgraph-12.2/:/home/prv/ns-allinone-2.35/bin/:/home/prv/ns-allinone-2.35/tcl8.5.10/unix/:/home/prv/ns-allinone-2.35/tk8.5.10/unix/
NS=/home/prv/ns-allinone-2.35/ns-2.35/
NAM=/home/prv/ns-allinone-2.35/nam-1.15/
export PATH=$PATH:$XGRAPH:$NS:$NAM