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X DISPLAY issue with sudo
When ettercap is started via sudo trying to launch the GTK graphical user interface, permissions issues accessing the root's $DISPLAY variable potentially occur, depending on the distribution's default security settings.
The following shows a typical symptom of the issue:
$ sudo ettercap -G
ettercap 0.8.2 copyright 2001-2015 Ettercap Development Team
No protocol specified
GTK+ failed to initialize. Is X running?
There is a easy fix to this issue. Run the following command in the user's context.
$ xhost local:root
If it doesn't work, try with pkexec
$ ettercap-pkexec -G
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