Install a Font

Many Truetype fonts are available in the Ubuntu and SIL repositories. These may be installed through Synaptic: Xfce Menu--System--Synaptic. Search for "ttf" or "font" to see the options.
SIL Charis, SIL Doulos, Andika Basic, and Gentium fonts are installed in Balsa.
To install another Truetype font, see these instructions:
How to install fonts in Ubuntu