problem with wireshark application

hi everyone , I installed wireshark on my ubuntu 11.10 laptop ,but it tells me no interfaces can be used for capturing with this configuration , so how can I solve this problem ??

Thanks in advance.

i know i shouldn't even be making this post ,because i don't have an answer ,but i do have a link that seems to have all the answer and videos to show you how to use the program ,good luck .
http://www.wireshark.org/docs/

To use wireshark under Linux you probably need to be a superuser, for obvious security reasons.

do sudo wireshark?

thanks a lot jbennet it worked

sudo usermod -a -G wireshark $USER