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Copy font files to a font directory in the user's home directory `.local/share/fonts`.
Update the font cache.
Command line
If you prefer a command line interface, you can install user fonts manually. Follow these steps in a terminal window to install a font locally:
Create a new directory `~/.local/share/fonts/<font-family-name>/` for the new font family
`mkdir -p ~/.local/share/fonts/robofont`
`cp ~/Downloads/robofont.ttf ~/.local/share/fonts/robofont`
`fc-cache -v`