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Fix “Unable to lock the administration directory (/var/lib/dpkg/)” in Ubuntu https://www.tecmint.com/fix-unable-to-lock-the-administration-directory-var-lib-dpkg-lock/   Installing architexa (eclipse plugin to build class diagram of projects) http://arvindpandeblog.blogspot.in/2017/01/steps-to-install-network-simulator-ns2.html http://www.architexa.com/learn-more/download STEPS TO INSTALL NETWORK SIMULATOR NS2 ON UBUNTU 16.04 http://arvindpandeblog.blogspot.in/2017/01/steps-to-install-network-simulator-ns2.html guidlines https://github.com/wangzhizhou/Network-Simulator-Installation-Guideline-For-Ubuntu