Here is a guide to install Wine 1.6 on Ubuntu 13.04. You can install Wine by adding the Ubuntu Wine Team PPA to your system.
Wine is a free and open source software application that aims to allow applications designed for Microsoft Windows to run on Unix-like operating systems. Wine also provides a software library, known as Winelib, against which developers can compile Windows applications to help port them to Unix-like systems.
Wine is a compatibility layer. It duplicates functions of Windows by providing alternative implementations of the DLLs that Windows programs call, and a process to substitute for the Windows NT kernel. This method of duplication differs from other methods that might also be considered emulation, where Windows programs run in a virtual machine. Wine is predominantly written using black-box testing reverse-engineering, to avoid copyright issues.
To add the PPA and install Wine 1.6 open a terminal window (press Ctrl+Alt+T) and copy+paste the following lines:
sudo add-apt-repository ppa:ubuntu-wine/ppa -y
sudo apt-get update && sudo apt-get install wine1.6 -y
When the installation is finished you can close the terminal window. You can now install and run Windows software using Wine. Please note that not all Windows software run on Wine.