I've installed 16.04 but I don't see the extra package in Software for getting more fonts, do you know how to install it? Thanks in advance.
Ubuntu Software only shows applications, i.e. basically programs with a graphical UI. Help packages, such as extra fonts, can be installed from a terminal window. If you want a graphical interface to browse all available packages and install those extra fonts you want, you can install Synaptic.
sudo apt install synaptic