This shark is crazy!

Hi, I have installed wireshark on Ubuntu14.04. Nothing is happening…?
Most of the buttons are dulled out and nothing is captured.
Ive googled and apparently i have to give privilege mode to packet capturing (whatever that means). I’ve watched a few online videos but nothing coveres this problem. Also I’m sure the download isnt corrupted, i think its a configuration issue.

please help.

x