Location of the fonts in Ubuntu

Most fonts are located in /usr/share/fonts
But there isn’t just one folder. You can find the location of all the font folders in /etc/fonts/fonts.conf
You can save custom fonts in the folder ~/.fonts . It’s possible that the folder doesn’t exist, so you have to create it.
The filenames of some fonts are different from the actual fontname. Search in the directory for parts of the fontname. Eg: the “Monospace” font in Ubuntu is actually an alias for DejaVuSansMono and is called ttf-dejavumono.ttf
“sans” or “sans serif” like Arial, is a font with no accents attached to the characters. (sans is French for “without”). Use for screens and websites.
“serif“, like Times New Roman, is with accents attached to the characters. Use this for printing text or books.
“mono” or “monospaced” like Courier New, is a font which characters are equally wide. Use this for coding and html.
To clear the font cache, like when you’ve downloaded a new font, use this command:
sudo fc-cache -vf