Is Ubuntu font free for commercial use?

Permission is hereby granted, free of charge, to any person obtaining a copy of the Font Software, to propagate the Font Software, subject to the below conditions: Each copy of the Font Software must contain the above copyright notice and this licence.

How do I see installed fonts in Ubuntu?

Installing downloaded fonts in Ubuntu 10.04 LTS

Open the folder where you have downloaded the font file. Double click on the font file to open it. This opens a font viewer window.