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With your setup the Ubuntu laptop will not be able to see the traffic between the RPi and the internet as it won't be transmitted over WiFi an the router is a switch so will only send traffic to the port that requires it.
You may be able to capture traffic on the router itself, or configure the router to mirror or span the traffic on the RPi port to another port that you connect your Ubuntu laptop to, or you can capture directly on the RPi, e.g. with TCPDump.
