Install WINE on Ubuntu Gutsy

Latest install instructions are always at: WineHQ.org

Add repository key:

wget -q http://wine.budgetdedicated.com/apt/387EE263.gpg -O- | sudo apt-key add -

Add repository to apt sources:

sudo wget http://wine.budgetdedicated.com/apt/sources.list.d/gutsy.list -O /etc/apt/sources.list.d/winehq.list

Update apt sources:

sudo apt-get update

Install WINE:

sudo apt-get install wine

The program menu then appears in Programs under Wine, or double-click a Windows/DOS .exe file.