Latest Version of Wireshark Available on Launchpad

Add the launchpad repository to get the current (now 2.2.5) on 16.04 LTS

sudo add-apt-repository ppa:wireshark-dev/stable

sudo apt-get update

Setting dumpcap permissions

After the update remember to change back permission to dumpcap to be able to capture with a not root user:

sudo chmod 755 /usr/bin/dumpcap