2023
https://www.linuxfordevices.com/tutorials/linux/install-a-font-in-linux
    /usr/share/fonts/
    /usr/local/share/fonts/
    ~/.local/share/fonts/

    fc-cache -fv
    fc-cache -fv "~/.local/share/fonts/"
    fc-list | grep <font name>

apt (ui)
    font-viewer
    gnome-font-viewer

post_install() {
  echo -n "Updating font cache... "
  mkfontscale /usr/share/fonts/TTF > /dev/null 2>&1
  mkfontdir /usr/share/fonts/TTF > /dev/null 2>&1
  fc-cache -s >/dev/null
  echo "done"
}