Darkstat won't start

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http://askubuntu.com – After building & then starting 'darkstat' application from officila sources I got the following error: darkstat -i eth0 27590: error: pcap_open_live(): eth0: You don't have permission to capture on that device (socket: Operation not permitted) Thus I tried with sudo but: sudo darkstat -i eth0 sudo: darkstat: command not found darkstat operates from /usr/local/sbin/darkstat its installed without any error: darkstat darkstat 3.0.715 (using libpcap version 1.2.1) usage: darkstat [ -i interface ] [ -r file ] [ -p port ] (HowTos)