Turning on Single Click in Ubuntu Linux will save you time and your mouse button from breaking faster since now you just have to click your left mouse button once to open files, folders, and programs in Ubuntu 9.10 Linux.
All you have to do is open up any folder like your Home Folder in Ubuntu, and go to edit menu option on the top of your folder explorer.
Pick Preferences from the edit drop down menu then go to Behavior.
In Behavior, pick Single or Double Click if you turn on either single or double click the one that is not selected will be off.
Click Close on the Preferences Window. Now you can launch programs with one click which will save you a click, and extend the life of your left mouse button since you use it less now.