You don't want just anybody opening windows on your screen, do you. "This has to do with access control to your X server. What was the point in granting access to the other user if they can't open the program anyway? This separating is done for security reasons, so isn't making that above modification reverting the earlier comment 'export AUTHORITY=/home/greg/.Xauthority'." Or root can take it, because it can access your files: You (greg) can grant it by means of 'xhost local:root'. "You have two ways to get this working: grant it or have root take it. And the gtk-warning cannot open display seems to relate exactly to this issue. The "no protocol specified" part seems pretty straight forward. I get the following error: no protocol specified But when I try to start wireshark as the wireshark user, using: sudo -s -u $USER wireshark I am setting up wireshark to run as non root user, a la here, that is: sudo apt-get install wireshark
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