How to use the PPA on Ubuntu ?

First launch Synaptic (System => Administration => Synaptic package manager); in the "Settings" menu, choose "Repositories". In the "Other software" tab, click the "Add" button. Enter the following source:

ppa:taskcoach-developers/ppa

and click the "Add source" button. Back to Synaptic, click the "Reload" button. Now Task Coach should be listed in the package list, and it will automatically be updated to the latest version whenever you install updates.