Enter your user account password and click Authenticate :
After that, the font set will automatically download and install on the system. This process will take a few minutes depending on the speed of your Internet connection:
When finished, you can log off then log in so the system recognizes the entire new font. Check back with text editors (in this article we use OpenOffice Writer, in default mode OpenOffice uses Liberation Serif font, but after installing Core Microsoft Fonts, the system will automatically switch to Times New Roman):
Install other font sets
Besides Microsoft Core Fonts, the Ubuntu Software Center system comes with hundreds of other free fonts available:
When you find a set of pleasant fonts, double-click to see in preview mode and install if you want:
The above is one of the easiest methods to add system fonts in Ubuntu without having to remember complex commands. Good luck!
( Source : HowToGeek)