Quick note on adding a truetype font or fonts to Ubuntu Linux (also applies to Debian and perhaps some other distros too).

cd /usr/share/fonts/truetype     (presumably this could be done in /usr/local/share/fonts/truetype, instead)
sudo mkdir myfonts
cd myfonts
sudo cp ~/*.ttf .
sudo chown root.root *.ttf
# Might also need to:  "sudo mkfontscale" (or "sudo ttmkfdir" - seems to be an older by slightly different implementation) to generate fonts.scale
sudo mkfontdir
cd ..

Not sure if this this "proper" way to add fonts, but it seems to work! --- comments welcome.