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SYN-bit's avatar
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SYN-bit
answered 2019-08-23 11:47:56 +0000

What does echo $DISPLAY say? If it is not set, Wireshark doesn't know where to send the graphical output. This is usually a problem by logging in from one shell to another. An other problem could be that the DISPLAY variable is set, but you are not running an X-server on the machine where DISPLAY points to.