Ubuntu Font Family web page and click on the
apt-get install ttf-ubuntu-font-familyhyperlink. This will open a Launch Application dialog.
apturloption (if it isn't already highlighted) and click OK.
That's it! To use the font on your desktop and in your applications, go to the Appearances editor (Preferences > Appearances) and select the Fonts tab. To use the font in Open Office, just scroll through the font options as usual.
Sources and References:
Ubuntu Ubuntu Font
Ubuntu Font Family Download