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 a protocol analyzer software, good for monitorizing the network traffic. The latest version available is Wireshark 1.10.7, which has been recently released. For information about this release, see the changelog.
In this article I will show you how to install Wireshark 1.10.7 on Ubuntu 14.04 Trusty Tahr, Ubuntu 13.10 Saucy Salamander, Ubuntu 12.04 Precise Pangolin, Linux Mint 17 Qiana, Linux Mint 16 Petra, Linux Mint 13 Maya and Elementary OS 0.2 Luna.
Because it will be available via PPA soon, installing Wireshark 1.10.7 on the listed Ubuntu, Linux Mint and Elementary OS systems is easy. All you have to do is add the ppa to your system, update the local repository index and install the wireshark package. Like this:
$ sudo add-apt-repository ppa:pi-rho/security
$ sudo apt-get update
$ sudo apt-get install wireshark
Optional, to remove wireshark, do:
$ sudo apt-get remove wireshark
Or, you can disable the PPA, remove wireshark and downgrade all the packages updated via that PPA, do:
$ sudo apt-get install ppa-purge
$ sudo ppa-purge ppa:pi-rho/security