20th July 2017, 0:21
These are system fonts and the font tool usually is only there for previewing and installing new fonts locally (ok granted it has a system install option aswell but in general it is basically used as tool to install one font file and not a whole font family).
Those font families are usually packaged up in a deb package and handled by the packagemanager
Those font families are usually packaged up in a deb package and handled by the packagemanager