Edit: Due to the fact that this article is old, the installation instructions may not work anymore. In order to successfully install the latest version of Wireshark, please access the wireshark tag and open the latest article (the one on top).

The latest installation instructions for Wireshark
Hello Linux Geeksters. As you already know, Wireshark is an protocol analyzer software. It is very good for monitorizing the network traffic. The latest version available is Wireshark 1.10.2, which has been released recently. For a full list of changes and improvements, see the official changelog.
In this article I will show you how to install Wireshark 1.10.2 on Ubuntu 13.10 Saucy Salamander, Ubuntu 13.04 Raring Ringtail, Ubuntu 12.10 Quantal Quetzal, Ubuntu 12.04 Precise Pangolin, Linux Mint 16 Petra, Linux Mint 15 Olivia, Linux Mint 14 Nadia, Linux Mint 13 Maya and Elementary OS 0.2 Luna.
Wireshark 1.10.2 is available via PPA only for Ubuntu 12.04 Precise Pangolin and derivates, including Linux Mint 13 Maya and Elementary OS 0.2 Luna. For the listed systems, this is what you have to do to install it:
$ sudo add-apt-repository ppa:whoopie79/ppa
$ sudo apt-get update
$ sudo apt-get install wireshark
To install Wireshark 1.10.2 on Ubuntu 13.10 Saucy Salamander, Ubuntu 13.04 Raring Ringtail, Ubuntu 12.10 Quantal Quetzal, Linux Mint 16 Petra, Linux Mint 15 Olivia and Linux Mint 14 Nadia, I will use the repository from precise. On my system, the installation has been done successfully so problems should not occur if you follow the instructions exactly.
Add the PPA to the system, for Precise:
$ sudo sh -c 'echo "deb http://ppa.launchpad.net/woopie79/ppa/ubuntu precise main" >> /etc/apt/sources.list
Update the local repository index and install Wireshark 1.10.2:
$ sudo apt-get update
$ sudo apt-get install wireshark
After you have successfully installed Wireshark 1.10.2, remove the PPA from your system, with this oneliner, in order not to get future issues and updatet the local system again.
$ sudo sed '/wireshark/d' /etc/apt/sources.list
$ sudo apt-get update
The sed oneliner removes all the lines containing wireshark, from the /etc/apt/sources.list file. Since Wireshark does not have a dedicated PPA, the sed trick should not break anything else. If you are paranoid, backup the /etc/apt/sources.list file before you use the sed oneliner, in order to be sure that you can easily revert the changes, with the command: sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak.