As you already know, Wireshark is an open-source protocol analyzer software, very used for monitoring the network traffic.
In this article I will show you how to install Wireshark 2.1 Git, which is unstable, but the first one to receive new features.
Up to date packages are available via PPA, so installing the software on Ubuntu should not cause problems to anyone.
All you need to do is add the PPA to your system, update the local repository index and install the wireshark package:
$ sudo add-apt-repository ppa:dreibh/ppa
$ sudo apt-get update
$ sudo apt-get install wireshark
Optional, to remove wireshark, do:
$ sudo apt-get remove wireshark
The installation instructions should work on Ubuntu 15.10 Wily Werewolf, Ubuntu 15.04 Vivid Vervet, Ubuntu 14.04 Trusty Tahr, Linux Mint 17.x, Elementary OS 0.3 Freya and other Ubuntu derivative systems.