Install New Font in Inkscape on Ubuntu

1. Create a folder for the font in /usr/share/fonts/truetype. (Of course, this is only for TTFs)
2. Move the .ttf file into the newly created folder.
3. Delete the font caches at /usr/share/fonts/*fonts-cache-1 and ~/*fonts.cache-1.
4. Restart Inkscape.
5. Enjoy the new font!

Reference: https://www.youtube.com/watch?v=6C3hC47JatY