Great tool.   need do some changes as below said by Trenton VanderWert.  You mayb also see this info from /usr/share/doc/wireshark-common/README.Debian


sudo dpkg-reconfigure wireshark-common

press the right arrow and enter for yes

sudo chmod +x /usr/bin/dumpcap

you should now be able to run it without root


摘自:Ubuntu软件中心