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To be honest. I am not sure what you try to accomplish here. But it seems that you interpreted USERNAME as a literal text where it should be your user.

Better would be to add your user to the wireshark group that allready exists. But these are sysadmin tasks that you should delegate to your sysadmin. And an article like https://www.howtogeek.com/50787/add-a-user-to-a-group-or-second-group-on-linux/ might help you out as well.

To be honest. I am not sure what you try to accomplish here. But it seems that you interpreted USERNAME as a literal text where it should be your user.user name with which you login.

Better would be to add your user to the wireshark group that allready exists. But these are sysadmin tasks that you should delegate to your sysadmin. And an article like https://www.howtogeek.com/50787/add-a-user-to-a-group-or-second-group-on-linux/ might help you out as well.