The problem is AppArmor just change it to complain:
# aa-complain /usr/sbin/tcpdump
(WARNING! This will disable apparmor for tcpdump, to reenable use:
# aa-enforce /usr/sbin/tcpdump)

Also you have to run tcpdump so that it will dump th eoutput to a file using 
the -w command:
# tcpdump -i usb1 -w output

Now you can open output in wireshark and everything will work fine...

Should a bug should be opened to change the default apparmor rule?
Also, shouldn't wireshark have a GUI for capturing from usb in the interfaces 
dialog?

-- 
wireshark/libpcap does not support sniffing USB streams
https://bugs.launchpad.net/bugs/355613
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