How to install many font files quickly and easily?
Solution 1:
Just create a .fonts
folder in your home directory (if it doesn't exist) and unpack/copy them there.
It's also a good idea to manually rebuild the font cache, so you can immediately use the fonts everywhere:
fc-cache -f -v
For more details see also https://wiki.ubuntu.com/Fonts
Solution 2:
Font Manager
Can manage multiple fonts easily with this application.
Can install mutiple fonts at a once.
To install new fonts click on "Manage Fonts" button as on the picture and click on "Install Fonts" in menu.
Can be installed with Software Center or with this command;
sudo apt-get install font-manager