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