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Thread: cannot do sudo wireshark - Gtk-WARNING **: cannot open display:

  1. #1

    cannot do sudo wireshark - Gtk-WARNING **: cannot open display:

    When I launch wireshark(from k-menu..run, or from the command line) it loads but doesn't list interfaces unless I do sudo wireshark or I suppose if I do su then wireshark. That's fine.
    But sudo wireshark or su<ENTER>wireshark<ENTER> isn't working.

    It worked yesterday but now when I try, I get this error






    knoppix@Microknoppix:~$ su root
    root@Microknoppix:/home/knoppix# wireshark
    No protocol specified

    (wireshark:4986): Gtk-WARNING **: cannot open display: :0
    root@Microknoppix:/home/knoppix# su knoppix
    knoppix@Microknoppix:~$ sudo wireshark
    No protocol specified

    (wireshark:503: Gtk-WARNING **: cannot open display: :0
    knoppix@Microknoppix:~$

  2. #2
    Moderator Moderator
    Join Date
    Nov 2010
    Location
    Germany/ Dietzenbach
    Posts
    1,124
    Do not run wireshark as user "root"!
    Read some documentations about wireshark. Your problem isn't a Knoppix problem.

  3. #3
    Thanks. I got it to work since some days back. For the record it was most likely this solution that I used

    http://ask.wireshark.org/questions/7...erfaces-listed
    $ sudo apt-get install wireshark
    $ sudo dpkg-reconfigure wireshark-common
    $ sudo usermod -a -G wireshark $USER
    $ sudo reboot

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