pslog

globally available fonts are stored in /usr/share/font and personal fonts which are only available for that specific user are stored in the user’s home directory in a sub directory .fonts. to install new fonts simply copy them to either the global or the user’s font directory (you need root privileges for the global one) and then reload the font cache and probably restart the application you want to use the font in (in case you where already running the application). to reload the font cache execute the folowing command in a shell

sudo fc-cache -f -v

as far as i know ubuntu by default supports truetype, postscript and openfonts.