I'm using Ubuntu 13.04 but Wireshark won't show me any logs, won't function at all I'm connected to my WiFi, Belkin router.
Open a terminal by pressing Ctrl+Alt+T and type the following commands:
press the right arrow and enter for yes
you should now be able to run it without root and you will be able to capture.
The "No interface can be used for capturing in this system with the current configuration" message commonly appears when you don't have the privileges to access the network interfaces for monitoring. Try opening a terminal and running gksudo wireshark. If several network interfaces appear, it's because when you run wireshark without root permissions you don't have the privileges to monitor.
To fix that, run the following command in a terminal: