Ubuntu font rendering is pretty good already . However , using Freetype with the Infinality patches can improve font rendering even more .
The easiest way to install the patches is by using the OpenSUSE build service and downloading the Ubuntu 16.04 .deb file .
After the download is complete navigate to the location of the .deb file right click it -> Open with -> Gdebi Package Installer .
In order for the new settings to take effect reboot your computer !
Note : if you do not have gdebi installed on your system you can install it by opening a terminal (ctrl+alt+t) and using the following command : sudo apt install gdebi