How To Install Multiple Fonts At Once From .zip Files?

This is a one-liner in a terminal. Open a terminal with Ctr+Alt+T and run the commands below. Replace <your_font_zips> with the folder name, where you have placed your zip font files.

cd <your_font_zips>
# next command extracts all TTF and OTF files into your `.fonts` folder.
unzip "*.zip" "*.ttf" "*.otf" -d ${HOME}/.fonts
# next command rebuilds font cache
sudo fc-cache -f -v

If you want to remove the fonts again, then simply delete the TTF files in your .fonts folder and rebuild the font cache.

More about fonts and Ubuntu here.

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And yes, you need all TTF files.

TTF and/or OTF

I quote:

OTF is more likely to be a “better” font, as it supports more advanced typesetting features (smallcaps, alternates, ligatures and so on actually inside the font rather than in fiddly separate expert set fonts). It can also contain either spline (TTF-style) or Bezier (PostScript Type 1-style) curves, so hopefully you're getting the shapes the font was originally designed in and not a potentially-poorer-quality conversion.

_Source