This article will use Bitwise.ttf as a sample TrueType Font to be installed on Ubuntu 18.04 Desktop.
This font and many other fonts can be freely downloaded from the https://www.1001freefonts.com/ website.
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-install-fonts-on-ubuntu-18-04-bionic-beaver-linux