To capture packets with wireshark on Debian without root, one must complete a couple of steps. I’ll show you how it works!
1. First install wireshark if you have not already:
$ sudo apt-get install wireshark
2. Next, run the following command and choose yes:
$ sudo dpkg-reconfigure wireshark-common
3. Next add your username to the group wireshark:
$ sudo gpasswd -a username wireshark
$ sudo gpasswd -a stmiller wireshark [sudo] password for stmiller: Adding user stmiller to group wireshark
4. Finally, log out and back in for changes to go into effect. Now running wireshark as your regular user allows the ability to capture packets.