Enable wireshark sniffing by not privileged user:
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$ dpkg-reconfigure wireshark-common

[Response yes]

$ sudo adduser $USER wireshark
$ sudo groupadd wireshark
$ sudo usermod -a -G wireshark $USER
$ sudo chgrp wireshark /usr/bin/dumpcap
$ sudo chmod 750 /usr/bin/dumpcap
$ sudo setcap cap_net_raw,cap_net_admin=eip /usr/bin/dumpcap
$ sudo getcap /usr/bin/dumpcap

.