This question already has an answer here:

This message appears:

No interface can be used for capturing in this system with the current configuration.

(couldn't run /usr/bin/dumpcap in child process: permission denied)

Tell me how to avoid it.

marked as duplicate by Tim, Eric Carvalho, Pilot6, Parto, David Foerster Mar 23 '16 at 12:35

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • you could run it temporary as root - this would be a workaround regarding the missing interfaces. Wireshark should display a dialog/warning regarding root usage in that case – dufte Mar 22 '16 at 12:16

As @Tim already mentioned - this problem was discussed before already. This post gives the proper solution - just tested it in 14.04 and it is still valid & working

The following is a 100% quote from here.

Open a terminal by pressing Ctrl+Alt+T and type the following commands:

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 and you will be able to capture.

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