wireshark installing

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http://askubuntu.com – I m going to install wireshark from the following youtube video http://www.youtube.com/watch?v=_YYEIV35IlE sudo apt-get install wireshark libcap2-bin sudo groupadd wirshark sudo usermod -a -G wireshark debbase But I faced problem while I ran the command sudo usermod -a -G wireshark debbase. It gives the error: user 'debbase' does not exist What should I do? (HowTos)